Multi-card compatible self-service water purchasing and recharging mobile payment terminal system and working method thereof

Abstract

According to the multi-card compatible self-service water purchasing and recharging mobile payment terminal system and the working method thereof, a terminal device connected to an Internet of Things system obtains the basic attribute of a water meter card, a remote server verifies whether the water meter card is legal or not, and if the water meter card is legal, the remote server obtains the basic attribute of the terminal device and the basic attribute of the legal water meter card; generating classification attributes of the legal water meter cards; the remote server uses the remote server address, the classification attribute of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction to read the information of the legal water meter card; according to the information of the legal water meter card and the basic attribute of the legal water meter card, the terminal device generates operation information of the legal water meter card; according to the operation information of the legal water meter card, the user completes operation on the terminal device; after the remote server updates the information of the legal water meter card, a remote database updating instruction is formed, and the information, stored in a remote database, of the legal water meter card is updated; and water meter card recharging of various manufacturers is supported.

Description

Technical Field

[0001] The present invention belongs to the technical field of Internet of Things devices, and in particular, relates to a multi-card compatible self-service water purchase and recharge mobile payment terminal system and a working method thereof. Background Art

[0002] Since its birth, IC card water meter has been positioned to reduce the tedious workload of manual door-to-door meter reading, and has been widely used and promoted in the market. Due to cost and technical issues, IC card water meter still has a very high market share in many markets. In order to solve the problem of online payment for IC card water meter users, most water meter manufacturers or water companies use a single IC card based remote water meter recharge device. The existing IC card remote water meter recharge device includes a card reader / writer module, a display module and a CPU processing module.

[0003] In the prior art, due to the confidentiality of IC card resources of each water meter manufacturer, the existing IC card remote water meter recharge device can only support remote recharge of its own IC card water meter, and cannot be compatible with IC card water meters of other manufacturers. For a region, there are water meters from several manufacturers. The existing IC card remote water meter recharge device is difficult for ordinary residents to use. They cannot identify which manufacturer their water meter belongs to, let alone which device can be recharged remotely. Once the matching error occurs, the self-protection mechanism of each manufacturer's card will burn the card and make it invalid. It is necessary to replace the card, which wastes manpower and financial resources. For the water company, each manufacturer has different production processes and appearances, and different remote management methods, which makes management and maintenance difficult and costly. Some water meter manufacturers have stopped cooperating and cannot support remote recharge. Summary of the invention

[0004] In order to solve the deficiencies in the prior art, the present invention provides a multi-card compatible self-service water purchase and recharge mobile payment terminal system and its working method, which overcomes the single defect of IC card water meter remote recharge in the prior art and solves the cost and efficiency problems of multiple management and multiple maintenance.

[0005] The present invention adopts the following technical solution.

[0006] The present invention proposes a working method of a multi-card compatible self-service water purchase and recharge mobile payment terminal system, comprising: Step 1: After the terminal device connected to the Internet of Things system obtains the basic attributes of the water meter card, it verifies whether the water meter card is legal through the remote server. If it is legal, it goes to step 2; Step 2, the remote server obtains the basic attributes of the terminal device, and generates the classification attributes of the legal water meter card according to the basic attributes of the terminal device and the basic attributes of the legal water meter card; the remote server uses the remote server address, the classification attributes of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction to read the information of the legal water meter card stored in the remote database; Step 3, according to the basic attributes of the terminal device, the remote server sends the information of the legal water meter card and the basic attributes of the legal water meter card to the corresponding terminal device; according to the information of the legal water meter card and the basic attributes of the legal water meter card, the terminal device generates the operation information of the legal water meter card; Step 4, according to the operation information of the legal water meter card, the user completes the operation on the terminal device; the terminal device sends the basic attributes of the terminal device, the basic attributes of the legal water meter card and the user operation results to the remote server. After the remote server updates the information of the legal water meter card, the remote server uses the remote server address, the classification attributes of the legal water meter card, the ID number of the legal water meter card and the updated information of the legal water meter card to form a remote database update instruction to update the information of the legal water meter card stored in the remote database.

[0007] Preferably, the terminal device is first connected to the Internet of Things system and then obtains the basic attributes of the water meter card. When the terminal device is connected to the Internet of Things system, the identity authentication of the terminal device is performed.

[0008] Preferably, the basic attributes of the water meter card include: market attributes, ID number and card type; The basic attributes of the terminal device include: the device number of the terminal device.

[0009] Preferably, the remote server generates classification attributes of the legal water meter card according to the basic attributes of the terminal device and the basic attributes of the legal water meter card, including: After determining that the currently read water meter IC card is legal, the terminal device encodes the legal water meter IC card according to the market attribute, ID number, card type and device number of the terminal device, and uploads the code to the remote server, and the terminal device enters a state of waiting for a response from the remote server; The remote server parses the received code; based on the market attributes obtained by the analysis, the market classification attributes of the legal water meter card are generated based on the market classification model; based on the card type obtained by the analysis and the market classification attributes of the legal water meter card, the corresponding card type classification attributes are generated based on the card type classification model; the market classification attributes and card type classification attributes of the legal water meter card form the classification attributes of the legal water meter card.

[0010] Preferably, the remote server uses the remote server address, the classification attribute of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction in a preset data format to read the information of the legal water meter card stored in the remote database.

[0011] Preferably, the information of the legal water meter card stored in the remote database includes: QR code information and customer payment information.

[0012] Preferably, the remote server parses the received code; generates the market classification attributes of the legal water meter card based on the market classification model according to the market attributes obtained by the parsing; generates the corresponding card type classification attributes based on the card type classification model according to the card type obtained by the parsing and the market classification attributes of the legal water meter card, including: The remote server includes a C# client established based on a C# program. The market variable Market_Info defined in the entity class is set in the C# client to obtain the parsed market attribute market variable and input it into the market classification model. The market classification model outputs the market classification attribute of the legal water meter card and represents the market classification attribute in a preset data format. The C# client also sets the order variable Order_Info defined in the entity class to obtain the parsed card type; the C# client has a built-in derived model, which is used to generate a card type classification model corresponding to the market classification attributes of the legal water meter card. The order variable is input into the card type classification model, which outputs the card type classification attributes of the legal water meter card and represents the card type classification attributes in a preset data format. The market classification attribute and the card type classification attribute of the legal water meter card expressed in the preset data format form the classification attribute of the legal water meter card expressed in the preset data format.

[0013] Preferably, step 2 further comprises: After the terminal device enters the state of waiting for the remote server to respond, it sends a connection request signal to the remote server at a set time interval. When the remote server receives the code and the connection request signal, it sends a connection response signal to the terminal device, and the terminal device and the remote server establish a connection; After the terminal device is connected to the remote server, when the remote server cannot generate the market classification attribute and / or card type classification attribute of the legal water meter card, the remote server stops sending the connection response signal to the terminal device, and the terminal device and the remote server are disconnected; After the set delay, the remote server sends a connection termination signal to the terminal device and returns to step 1.

[0014] Preferably, the terminal device and the remote server adopt a WebSocket connection method, and the terminal device and the remote server exchange heartbeat packets, which include a connection request signal and a connection response signal; the time interval is set to be between 30 and 40 seconds, and the delay is set to 2 to 5 times the set time interval.

[0015] Preferably, step 3 includes: the C# client of the remote server parses the information of the read legal water meter card and sends it to the corresponding terminal device in a coded form, wherein the coded header information is the card type stored in the order variable.

[0016] Preferably, the information of the legal water meter card is encrypted and decrypted using the MD5 algorithm during transmission and update.

[0017] The present invention also proposes a multi-card compatible self-service water purchase and recharge mobile payment terminal system, comprising: a terminal device, a remote server and a remote database; After the terminal device connected to the Internet of Things system obtains the basic attributes of the water meter card, it verifies whether the water meter card is legal through the remote server. If it is legal, the remote server obtains the basic attributes of the terminal device, and generates the classification attributes of the legal water meter card according to the basic attributes of the terminal device and the basic attributes of the legal water meter card; the remote server uses the remote server address, the classification attributes of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction to read the information of the legal water meter card stored in the remote database; According to the basic attributes of the terminal device, the remote server sends the information of the legal water meter card and the basic attributes of the legal water meter card to the corresponding terminal device; according to the information of the legal water meter card and the basic attributes of the legal water meter card, the terminal device generates the operation information of the legal water meter card; According to the operation information of the legal water meter card, the user completes the operation on the terminal device; the terminal device sends the basic attributes of the terminal device, the basic attributes of the legal water meter card and the user operation results to the remote server. After the remote server updates the information of the legal water meter card, the remote server uses the remote server address, the classification attributes of the legal water meter card, the ID number of the legal water meter card and the updated information of the legal water meter card to form a remote database update instruction to update the information of the legal water meter card stored in the remote database.

[0018] Preferably, the terminal device includes: a card reader module, an MCU processor, a memory module, a wireless Internet of Things module, an aggregated payment channel, a computer module, a voice player, a serial port touch screen, a power adapter and a remote server; wherein the MCU processor is respectively connected to the card reader module, the memory module, the wireless Internet of Things module, the aggregated payment channel, the computer module, the voice player, the serial port touch screen and the power adapter.

[0019] The beneficial effects of the present invention are that, compared with the prior art, the multi-card compatible self-service water purchase and recharge mobile payment terminal system proposed by the present invention has a friendly human-machine interface, does not require manual operation throughout the process, and reduces labor costs. It can realize real-time recharge of water charges nearby, and can provide uninterrupted service 24 hours a day, which is convenient for users. It provides a variety of cashless payment methods, and users can choose the payment mode. It supports recharge of water meter cards from multiple manufacturers, realizes the effect of one machine for multiple uses, and saves user time. Through an external voice player and large font display, it is convenient for elderly users to know whether the recharge is successful in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a flow chart of a working method of a multi-card compatible self-service water purchase and recharge mobile payment terminal system proposed by the present invention; Figure 2 It is a structural block diagram of a terminal device of a multi-card compatible self-service water purchase and recharge mobile payment terminal system in an embodiment of the present invention; Figure 2 The reference numerals in the figures are described as follows: 1-card reader module, 2-MCU processor, 3-memory module, 4-wireless Internet of Things module, 5-aggregate payment channel, 6-computer module, 7-voice player, 8-serial port touch screen, 9-power adapter, 10-remote server. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The embodiments described in this application are only embodiments of a part of the present invention, rather than all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the protection scope of the present invention.

[0022] The present invention proposes a working method of a multi-card compatible self-service water purchase and recharge mobile payment terminal system. The terminal system comprises a terminal device, a remote server and a remote database, so as to realize recharge with multiple water meter cards compatible in one terminal system.

[0023] like Figure 1 As shown, after the water meter card is connected to the terminal device, the working method of the terminal system includes: Step 1: After the terminal device connected to the Internet of Things system obtains the basic attributes of the water meter card, it verifies whether the water meter card is legal through the remote server. If it is legal, it proceeds to step 2.

[0024] Specifically, the terminal device first connects to the Internet of Things system and then obtains the basic attributes of the water meter card. When the terminal device connects to the Internet of Things system, the identity authentication of the terminal device is performed to ensure the legitimacy of the terminal device to improve the reliability of the terminal system.

[0025] Specifically, the basic attributes of the water meter card include, but are not limited to: market attributes, ID number, and card type; Specifically, in a non-limiting preferred embodiment, the water meter card is inserted into the card reading port of the terminal device, and the built-in card reader module of the terminal device reads the basic attributes of different types of water meter IC cards, including but not limited to the ID number of the water meter IC card; the basic attributes are uploaded to the remote server through the terminal device to verify whether the user of the water meter IC card is legal and exists; if it is legal and exists, subsequent operations are performed, otherwise, an "illegal card" prompt is given.

[0026] Specifically, the terminal device includes but is not limited to: a fixed terminal device and a mobile terminal device. The mobile terminal device includes an APP software program. Therefore, Step 2, the remote server obtains the basic attributes of the terminal device, and generates the classification attributes of the legal water meter card based on the basic attributes of the terminal device and the basic attributes of the legal water meter card; the remote server uses the remote server address, the classification attributes of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction to read the information of the legal water meter card stored in the remote database.

[0027] Specifically, the basic attributes of the terminal device include, but are not limited to: a device number of the terminal device.

[0028] Specifically, the remote server generates classification attributes of the legal water meter card according to the basic attributes of the terminal device and the basic attributes of the legal water meter card, including: After determining that the currently read water meter IC card is legal, the terminal device encodes the legal water meter IC card according to market attributes, ID number, card type and device number of the terminal device, and uploads the code to the remote server. The terminal device enters a state of waiting for a response from the remote server.

[0029] The remote server parses the received code; based on the market attributes obtained by the analysis, the market classification attributes of the legal water meter card are generated based on the market classification model; based on the card type obtained by the analysis and the market classification attributes of the legal water meter card, the corresponding card type classification attributes are generated based on the card type classification model; the market classification attributes and card type classification attributes of the legal water meter card form the classification attributes of the legal water meter card.

[0030] The remote server uses the remote server address, the classification attribute of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction in a preset data format to read the information of the legal water meter card stored in the remote database.

[0031] Based on the remote server address, the classification attributes of the legal water meter card and the ID number of the legal water meter card, a remote database request instruction in a preset data format is formed, thereby providing a basis for multiple terminal devices to realize remote database sharing.

[0032] Specifically, the information of the legal water meter card stored in the remote database includes but is not limited to: QR code information, customer payment information, and own version information, in JSON data format.

[0033] In a non-limiting preferred embodiment, the remote server includes a C# client established based on a C# program, and a market variable Market_Info defined in an entity class is set in the C# client to obtain the parsed market attribute market variable and input it into a market classification model, and the market classification model outputs the market classification attribute of the legal water meter card, and the market classification attribute is represented in a preset data format; The C# client also sets the order variable Order_Info defined in the entity class to obtain the parsed card type; the C# client has a built-in derived model, which is used to generate a card type classification model corresponding to the market classification attributes of the legal water meter card. The order variable is input into the card type classification model, which outputs the card type classification attributes of the legal water meter card and represents the card type classification attributes in a preset data format. The market classification attribute and the card type classification attribute of the legal water meter card expressed in the preset data format form the classification attribute of the legal water meter card expressed in the preset data format.

[0034] Step 2 also includes: After the terminal device enters the state of waiting for the remote server to respond, it sends a connection request signal to the remote server at a set time interval. When the remote server receives the code and the connection request signal, it sends a connection response signal to the terminal device, and the terminal device and the remote server establish a connection; After the terminal device is connected to the remote server, when the remote server cannot generate the market classification attribute and / or card type classification attribute of the legal water meter card, the remote server stops sending the connection response signal to the terminal device, and the terminal device and the remote server are disconnected; After the set delay, the remote server sends a connection termination signal to the terminal device and returns to step 1.

[0035] Specifically, in a non-limiting preferred embodiment, the terminal device and the remote server use a WebSocket connection method, and heartbeat packets are exchanged between the terminal device and the remote server. The heartbeat packets include a connection request signal and a connection response signal. The time interval is set to a value between 30 and 40 seconds, and the delay is set to 2 to 5 times the set time interval.

[0036] The present invention realizes generating classification attributes of a legal water meter card according to the basic attributes of the terminal device and the basic attributes of the legal water meter card. The classification attributes provide a data basis for the terminal device to achieve multi-card compatibility, and the generated classification attributes can also serve as a basis for the terminal device to maintain connection with the remote server and a criterion for disconnecting the connection, so that the terminal system proposed by the present invention has a self-protection mechanism and can perform troubleshooting and recovery operations. On the basis of identity authentication when the terminal device accesses the Internet of Things system, based on the above-mentioned connection method, multiple terminal devices can be connected to the remote server at the same time, thereby improving the reliability of the terminal system in a multi-threaded and high-concurrency processing manner and avoiding single point failures.

[0037] Step 3, based on the basic attributes of the terminal device, the remote server sends the information of the legal water meter card and the basic attributes of the legal water meter card to the corresponding terminal device; based on the information of the legal water meter card and the basic attributes of the legal water meter card, the terminal device generates the operation information of the legal water meter card.

[0038] Specifically, the C# client of the remote server parses the information of the legal water meter card and sends it to the corresponding terminal device in a coded form, wherein the header information of the code is the card type stored in the order variable. The code consisting of the card type as the header information can also serve as an auxiliary basis for the terminal device to maintain the connection with the remote server and an auxiliary criterion for disconnecting the connection.

[0039] Specifically, the operation information includes but is not limited to: querying water consumption and purchasing water and recharging.

[0040] Step 4, according to the operation information of the legal water meter card, the user completes the operation on the terminal device; the terminal device sends the basic attributes of the terminal device, the basic attributes of the legal water meter card and the user operation results to the remote server. After the remote server updates the information of the legal water meter card, the remote server uses the remote server address, the classification attributes of the legal water meter card, the ID number of the legal water meter card and the updated information of the legal water meter card to form a remote database update instruction to update the information of the legal water meter card stored in the remote database.

[0041] Specifically, updating the information of the legal water meter card stored in the remote database includes but is not limited to: updating the customer payment information.

[0042] Specifically, in a non-limiting preferred embodiment, the information of the legal water meter card is encrypted and decrypted using the MD5 algorithm during transmission and update.

[0043] The present invention also proposes a multi-card compatible self-service water purchase and recharge mobile payment terminal system, the terminal system includes a terminal device, a remote server and a remote database; wherein, like Figure 2 As shown, the terminal device includes: a card reader module 1, an MCU processor 2, a memory module 3, a wireless Internet of Things module 4, an aggregate payment channel 5, a computer module 6, a voice player 7, a serial touch screen 8, a power adapter 9 and a remote server 10. Among them, the MCU processor is connected to the card reader module, the memory module, the wireless Internet of Things module, the aggregate payment channel, the computer module, the voice player, the serial touch screen and the power adapter respectively.

[0044] When the user card needs to be recharged, the order status needs to be updated. In order to increase the security of the order, encryption and decryption algorithms are used to verify whether the order is legal.

[0045] Specifically, the card reader module is used to read basic attributes of different types of water meter IC cards.

[0046] A memory module, used to store basic properties of different types of water meter IC cards; A display, used to display information of a legal water meter card and operation information of a legal water meter card; The aggregate payment channel is used for users to insert water cards and scan QR codes to pay online, and then write the recharge amount into the operation information of the legal water meter card; the aggregate payment channel provides a variety of cashless payment methods, and users can choose the payment mode.

[0047] The voice player is used to enhance and play the operations completed by the user on the terminal device.

[0048] The terminal device has a friendly human-machine interface, which enables real-time recharge of water fees nearby, and can provide 24-hour uninterrupted service, which is convenient for users. It provides a variety of cashless payment methods. You can choose the payment mode as long as you enter the WeChat applet. It supports recharge of water meter cards from multiple manufacturers, achieving the effect of one machine for multiple uses and saving user time. Through the external voice player and large font display, it is convenient for elderly users to know whether the recharge is successful in time.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A working method of a multi-card compatible self-service water purchase and recharge mobile payment terminal system, characterized in that: include: Step 1: After the terminal device connected to the Internet of Things system obtains the basic attributes of the water meter card, it verifies whether the water meter card is legal through the remote server. If it is legal, it goes to step 2; Step 2, the remote server obtains the basic attributes of the terminal device, and generates the classification attributes of the legal water meter card according to the basic attributes of the terminal device and the basic attributes of the legal water meter card; the remote server uses the remote server address, the classification attributes of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction to read the information of the legal water meter card stored in the remote database; Step 3, according to the basic attributes of the terminal device, the remote server sends the information of the legal water meter card and the basic attributes of the legal water meter card to the corresponding terminal device; according to the information of the legal water meter card and the basic attributes of the legal water meter card, the terminal device generates the operation information of the legal water meter card; Step 4, according to the operation information of the legal water meter card, the user completes the operation on the terminal device; the terminal device sends the basic attributes of the terminal device, the basic attributes of the legal water meter card and the user operation results to the remote server. After the remote server updates the information of the legal water meter card, the remote server uses the remote server address, the classification attributes of the legal water meter card, the ID number of the legal water meter card and the updated information of the legal water meter card to form a remote database update instruction to update the information of the legal water meter card stored in the remote database.

2. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 1 is characterized in that: The terminal device is first connected to the Internet of Things system and then obtains the basic attributes of the water meter card. When the terminal device is connected to the Internet of Things system, the identity authentication of the terminal device is performed.

3. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 1, characterized in that: The basic attributes of the water meter card include: market attributes, ID number and card type; The basic attributes of the terminal device include: the device number of the terminal device.

4. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 3 is characterized in that: The remote server generates classification attributes of a legal water meter card according to the basic attributes of the terminal device and the basic attributes of the legal water meter card, including: After determining that the currently read water meter IC card is legal, the terminal device encodes the legal water meter IC card according to the market attribute, ID number, card type and device number of the terminal device, and uploads the code to the remote server, and the terminal device enters a state of waiting for a response from the remote server; The remote server parses the received code; based on the market attributes obtained by the analysis, the market classification attributes of the legal water meter card are generated based on the market classification model; based on the card type obtained by the analysis and the market classification attributes of the legal water meter card, the corresponding card type classification attributes are generated based on the card type classification model; the market classification attributes and card type classification attributes of the legal water meter card form the classification attributes of the legal water meter card.

5. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 4 is characterized in that: The remote server uses the remote server address, the classification attribute of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction in a preset data format to read the information of the legal water meter card stored in the remote database.

6. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 5, characterized in that: The information of the legal water meter card stored in the remote database includes: QR code information and customer payment information.

7. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 4, characterized in that: The remote server parses the received code; according to the market attributes obtained by the parsing, the market classification attributes of the legal water meter card are generated based on the market classification model; According to the parsed card type and the market classification attributes of the legal water meter card, the corresponding card type classification attributes are generated based on the card type classification model, including: The remote server includes a C# client established based on a C# program. The market variable Market_Info defined in the entity class is set in the C# client to obtain the parsed market attribute market variable and input it into the market classification model. The market classification model outputs the market classification attribute of the legal water meter card and represents the market classification attribute in a preset data format. The C# client also sets the order variable Order_Info defined in the entity class to obtain the parsed card type; the C# client has a built-in derived model, which is used to generate a card type classification model corresponding to the market classification attributes of the legal water meter card. The order variable is input into the card type classification model, which outputs the card type classification attributes of the legal water meter card and represents the card type classification attributes in a preset data format. The market classification attribute and the card type classification attribute of the legal water meter card expressed in the preset data format form the classification attribute of the legal water meter card expressed in the preset data format.

8. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 4, characterized in that: Step 2 also includes: After the terminal device enters the state of waiting for the remote server to respond, it sends a connection request signal to the remote server at a set time interval. When the remote server receives the code and the connection request signal, it sends a connection response signal to the terminal device, and the terminal device and the remote server establish a connection; After the terminal device is connected to the remote server, when the remote server cannot generate the market classification attribute and / or card type classification attribute of the legal water meter card, the remote server stops sending the connection response signal to the terminal device, and the terminal device and the remote server are disconnected; After the set delay, the remote server sends a connection termination signal to the terminal device and returns to step 1.

9. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 8, characterized in that: The terminal device and the remote server adopt the WebSocket connection mode, and the terminal device and the remote server exchange heartbeat packets, which include connection request signal and connection response signal; the time interval is set to be between 30 and 40 seconds, and the delay is set to 2 to 5 times of the set time interval.

10. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 7, characterized in that: Step 3 includes: the C# client of the remote server parses the information of the read legal water meter card and sends it to the corresponding terminal device in a coded form, wherein the coded header information is the card type stored in the order variable.

11. The working method of the multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 1, characterized in that: The information of legal water meter cards is encrypted and decrypted using the MD5 algorithm during transmission and update.

12. A multi-card compatible self-service water purchase and recharge mobile payment terminal system, characterized in that: include: Terminal devices, remote servers and remote databases; After the terminal device connected to the Internet of Things system obtains the basic attributes of the water meter card, it verifies whether the water meter card is legal through the remote server. If it is legal, the remote server obtains the basic attributes of the terminal device, and generates the classification attributes of the legal water meter card according to the basic attributes of the terminal device and the basic attributes of the legal water meter card; the remote server uses the remote server address, the classification attributes of the legal water meter card and the ID number of the legal water meter card to form a remote database request instruction to read the information of the legal water meter card stored in the remote database; According to the basic attributes of the terminal device, the remote server sends the information of the legal water meter card and the basic attributes of the legal water meter card to the corresponding terminal device; according to the information of the legal water meter card and the basic attributes of the legal water meter card, the terminal device generates the operation information of the legal water meter card; According to the operation information of the legal water meter card, the user completes the operation on the terminal device; the terminal device sends the basic attributes of the terminal device, the basic attributes of the legal water meter card and the user operation results to the remote server. After the remote server updates the information of the legal water meter card, the remote server uses the remote server address, the classification attributes of the legal water meter card, the ID number of the legal water meter card and the updated information of the legal water meter card to form a remote database update instruction to update the information of the legal water meter card stored in the remote database.

13. The multi-card compatible self-service water purchase and recharge mobile payment terminal system according to claim 12, characterized in that: The terminal device includes: a card reader module, an MCU processor, a memory module, a wireless Internet of Things module, an aggregate payment channel, a computer module, a voice player, a serial port touch screen, a power adapter and a remote server; wherein the MCU processor is respectively connected to the card reader module, the memory module, the wireless Internet of Things module, the aggregate payment channel, the computer module, the voice player, the serial port touch screen and the power adapter.

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