OpenCPU test terminal

Abstract

The utility model provides an OpenCPU test terminal, the module of the test terminal comprises a Cat.1 communication module, a drive expansion module, an SIM card drive module, a button array, an LED array, an ANT antenna module and a plurality of peripherals, the drive expansion module comprises a triode drive expansion and a serial port expansion, the Cat.1 communication module is internally provided with an Internet of Things chip, and the button array is provided with a serial port expansion. The chip is connected with the modules, the chip is integrated with an application layer processor of a programmable framework, the application layer processor can be used for secondary development of a driving program and an application program, and universal peripherals in the industry are integrated, so that protocols and functions can be tested more simply in the actual OpenCPU development process, and the development efficiency is improved. And the test terminal can communicate with a cloud server, the security peripheral can ensure the security of data to a certain extent, and the test terminal is simpler in hardware structure, higher in integration degree, smaller in size, high in portability and high in security.

Description

Technical Field

[0001] The utility model relates to the field of Internet of Things terminal testing, in particular to an OpenCPU testing terminal based on a communication module. Background Technique

[0002] With the rapid development of the Internet of Things industry, the number of Internet of Things devices has increased explosively, and the market demand has been continuously rising. With excellent performance, Cat.1 modules have higher transmission rates, wider coverage ranges, longer transmission distances, and stronger anti-interference capabilities compared to NB-IOT, and are widely used in many fields, including scenarios such as smart metering, remote maintenance and control, and smart cities.

[0003] However, in many Internet of Things application scenarios that pursue extreme cost performance, such as industrial automation or smart home environments, not only the remote communication capabilities of Cat.1 modules are required, but also the data processing capabilities of the OpenCPU inside the corresponding modules are needed to maximize the product cost performance. In this case, it is necessary to open the internal MCU and related peripherals on the basis of the basic communication functions provided by Cat.1 modules to meet more complex and diverse functional requirements, so as to achieve more efficient and cost-effective Internet applications.

[0004] In the existing OpenCPU application scenarios based on Cat.1 communication modules, a common solution adopted by different module manufacturers is to reserve different Pin foot interfaces on Cat.1 development boards.

[0005] For the solutions to the above existing problems, the advantage is that different users can freely choose peripherals according to their own needs, which is relatively flexible; the disadvantage is that each time different functions are debugged, wiring or soldering is required, which is time-consuming and laborious during some basic function and protocol tests, and at the same time occupies a relatively large volume. Moreover, due to the changes in the interfaces of each module, the general function tests of users also need to re-change the corresponding test interfaces.

[0006] For example, a testing device is disclosed on the Chinese Patent Network, with the application number CN202110882367.0. This patent is provided with multiple peripheral interface modules to freely select peripherals, but when some basic functions are changed, the corresponding test peripheral interfaces need to be re-changed, so it is not so portable during basic function and protocol tests.

[0007] Regarding the data transmission problem, the security issue during the communication of Cat.1 communication modules also needs to be considered. During remote testing, the data obtained by the peripherals is uploaded to a pre-determined cloud server through the Cat.1 communication module. During the upload of some sensitive data, there may also be problems of data leakage.

[0008] In actual tests, issues such as the environment, compatibility between the test terminal and the device, and the selection of operator networks for the test terminal and its device in different locations also need to be considered.

[0009] Taking the patent with the application number CN202120500450.2 as an example, in order to achieve the function of connecting to peripherals, this patent uses a USB driver interface as an expansion interface. USB has advantages such as a large amount of data transmission and strong applicability in actual use. However, the USB driver interface may not be able to adapt to some power devices and has certain deficiencies in current control capabilities.

[0010] In view of the above problems, the purpose of the present utility model is to provide an OpenCPU test terminal with higher integration, integrating the most common and simplified practical peripherals in the development board to make the application scenario more reasonable; at the same time, it has security during data upload and lower power consumption. Summary of the Utility Model

[0011] The present utility model aims to solve the problems of redundant operations, large occupied volume, low operation efficiency, and poor security in the original traditional test scheme. To achieve this goal, the present utility model adopts the following technical solutions:

[0012] The core communication module of the OpenCPU test terminal is a Cat.1 module. The core communication module of the OpenCPU test terminal is a Cat.1 module. The Cat.1 communication module is provided with a chip; the MAIN series pins, DBG series pins, and AUX series pins of the chip are connected to an expansion drive module; the USIM series pins of the chip are connected to a SIM card drive module; the MAIN series pins, NET series pins, and STATUS series pins of the chip are connected to several integrated peripherals.

[0013] Preferably, the SIM card drive module includes a SIM card socket J2. The second ends of three capacitors connected to the GND pin, VCC pin, RST pin, and CLK pin of the socket J2 are grounded; the first end of the resistor connected to the DATA pin of the socket J2 is connected to the USIM_DATA pin of the U2A chip; the CLK pin of the socket J2 is connected to the USIM_CLK pin of the chip; the RST pin of the socket J2 is connected to the USIM_RST pin of the chip; the VCC pin of the socket J2 is connected to the USIM_VCC pin of the chip.

[0014] Preferably, the chip is connected to a SIM card driver module; the chip is connected to integrated peripherals; an LED array is connected to the chip; a key array is connected to the chip and the chip; the chip is connected to the driver expansion module; the chip is provided with a USB BOOT emergency download module.

[0015] Preferably, the driver expansion module includes a triode driver expansion and a serial port expansion.

[0016] Preferably, the serial port expansion includes an AUX_UART expansion module and an AT download & Debug module.

[0017] Preferably, the USIM_DATA pin, USIM_RST pin, USIM_CLK pin and USIM_VDD pin of the chip are connected to the SIM card driver module; the ANT_MAIN pin of the chip is connected to the first end of the resistor R2, the second end of the resistor R2 is connected to the ANT antenna J1, the second and fourth pins of the ANT antenna are grounded, the first end of the resistor R3 is connected to the second end of the resistor R2 and the second end of the resistor R3 is grounded; the NET_STATUS pin, MAIN_RI pin and STATUS pin of the chip are connected to the integrated peripherals; the MAIN_TXD pin, MAIN_RXD pin, DBG_TXD pin and DBG_RXD pin of the chip are connected to the AT download & Debug module; the AUX_TXD pin and AUX_RXD pin of the chip are connected to the AUX_UART expansion module.

[0018] Preferably, the USIM2_DATA pin, USIM2_RST pin and USIM_CLK pin of the chip can be used to connect to peripherals with different powers.

[0019] Preferably, the USB BOOT pin of the chip is connected to a USB BOOT emergency download module.

[0020] Preferably, the integrated peripherals can include security peripherals, and the security peripherals can encrypt data, and the encryption method is asymmetric encryption.

[0021] Preferably, the chip model of the Cat.1 communication module is NT26K.

[0022] The serial port expansion function includes: for AT command and firmware download, LOG information viewing and debugging, and Cat.1 serial communication interface.

[0023] The key array function includes: Reset Cat.1 reset; Cat.1 BOOT pin, high level can enter the download mode; general keys, adapted to different function tests of the OpenCPU program.

[0024] The LED display array can output OpenCPU function test information.

[0025] The OpenCPU test terminal can be used alone with the peripherals integrated on the terminal for independent applications during use, or it can also use the peripheral expansion port to complete specific tasks together. The main working modes are as follows:

[0026] Cat.1 integrated Mode: Cat.1 is in an active state, the test terminal is normally available, and the basic peripherals of Cat.1 can be used. It can also be connected to the network to interact with a general server for data.

[0027] Cat.1 extended Mode: Cat.1 is in an extended mode, and it can perform IO and UART communications with general peripherals. The IO drive port can also directly control the remote switch application of user equipment.

[0028] PSM Mode, Cat.1 enters the PMS mode, only the RTC works, the network is in a non-connected state, no longer accepts paging messages, and can accept external wake-up.

[0029] The beneficial effects of the present utility model are as follows: 1) It is small in size and can be easily embedded into various Internet of Things application scenarios; 2) It integrates the most common peripherals in the industry, and can more simply test various protocols and functions during OpenCPU development, which can help developers more simply test various protocols and functions; 3) It can better ensure the security of data during data transmission; 4) It can adapt to peripherals with different powers; 5) It can adapt to relatively harsh working environments. Brief Description of the Drawings

[0030] Figure 1 It is a framework diagram of the present utility model.

[0031] Figures 2 to 5 It is a circuit schematic diagram of the communication module of the present utility model.

[0032] Figure 6 It is a circuit schematic diagram of the SIM card drive module of the present utility model.

[0033] Figure 7 It is a schematic diagram of the AT download & Debug port of the present utility model.

[0034] Figure 8 It is a schematic diagram of the AUX_UART expansion port of the present utility model.

[0035] Figure 9 It is a triode drive expansion circuit diagram of the present utility model.

[0036] Figure 10Schematic diagram of the working mode of Cat.1 expansion Mode of the present utility model. Detailed implementation manners

[0037] The following describes the specific technical solutions of the present utility model through embodiments and in conjunction with the accompanying drawings.

[0038] This embodiment is an OpenCPU test terminal. As Figure 1 shown, the core communication module of the OpenCPU test terminal is a Cat.1 communication module. The OpenCPU test terminal includes an ANT antenna, a SIM card driver module, an LED display array, a key array, an integrated peripheral and an expansion module.

[0039] The Internet of Things chip built in the Cat.1 communication module. The chip includes an integrated application layer processor. The Cat.1 communication module integrates the main control function in the application layer processor. The application layer integrates a programmable framework, which can be used for secondary development of customer driver programs and application programs, and provides common API function interfaces, including API commonly used in RTOS and common driver APIs, such as GPIO, ADC, DAC, SPI, I2C, UART, PWM, CAN, SDIO and Ethernet. Taking UART, an API, as an example, the function of UART_Init is to initialize the UART interface, set the baud rate, data bits, stop bits, etc.; the function of UART_Init is to initialize the UART interface, set the baud rate, data bits, stop bits, etc.; the function of UART_Receive is to receive data through the UART; the function of UART_Close is to close the UART interface. It also includes a Network interface, a Socket interface, a FOTA interface, etc.

[0040] As Figures 2 to 5 shown, the model of the Cat.1 communication module of the OpenCPU test terminal is a chip of N26K. Different bottom pin sets of the chip are represented by U2A, U2B, U2C, and U2B. The 11th, 12th, 13th, and 14th pins of U2A are connected to the SIM card driver module; the 16th, 20th, and 25th pins of U2A are connected to the integrated peripheral; the 35th pin of U2A is connected to the ANT antenna; the 17th, 18th, 38th, and 39th pins of U2A are connected to the AT download & Debug module; the 28th and 29th pins of U2A are connected to the AUX_UART expansion module; the 21st to 23rd pins of U2A and the 62nd to 64th pins, the 50th pin, and the 99th pin of U2B are all connected to the key array; the 97th pin of U2A is connected to the LED array module; the 82nd pin of U2C is connected to the USB BOOT emergency download module; all pins of U2D are grounded.

[0041] As shown Figure 6 in the figure, the SIM card driving module includes a card holder J2, capacitors C8 - C11 and a resistor R15; the second ends of capacitors C8 - C11 and the first pin of the card holder J2 are all grounded, the first end of the resistor R15, the first end of the capacitor C8 and the 3rd pin of the card holder J2 are connected to the 11th pin of U2A; the second end of the resistor R15, the 8th pin of the card holder J2 and the first end of the capacitor C9 are connected to the 14th pin of U2A; the first end of the capacitor C10 and the 7th pin of the card holder J2 are connected to the 12th pin of U2A; the first end of the capacitor C11 and the 6th pin of the card holder J2 are connected to the 13th pin of U2A.

[0042] Firstly, the cost of using a single capacitor for the circuit on the 6th to 8th pins of the card holder J2 is lower, including the price of the capacitor itself and the manufacturing cost of the PCB layout; secondly, the simplified design reduces the risk of errors, making the circuit easier to design and verify; furthermore, the single capacitor occupies less space, which is beneficial to the miniaturization and high - density PCB design; in addition, reducing the number of capacitors can also reduce the parasitic effects generated by the interconnection between multiple capacitors and improve signal integrity; finally, such a design is also convenient for debugging and maintenance because a simpler circuit is easier to locate and repair faults.

[0043] As shown Figure 7 in the figure, for the AT download & Debug port P1, the 1st pin of the P1 is connected to the 38th pin of the chip U2A; the 2nd pin of the P1 is connected to the 39th pin of U2A; the 3rd pin of the P1 is connected to the 17th pin of U2A; the 4th pin of the P1 is connected to the 18th pin of U2A; the 5th pin of the P1 is connected to a 3.8V voltage; the 6th pin of the P1 is grounded.

[0044] As shown Figure 8 in the figure, for the AUX_UART expansion port AUX_UART, the 1st pin of the AUX_UART is grounded; the 2nd pin of the AUX_UART is connected to the 29th interface of U2A; the 3rd pin of the AUX_UART is connected to the 28th pin of the chip.

[0045] As shown Figure 9 in the figure, in the triode driving expansion interface, the second end of the resistor R20 is connected to the 16th pin of U2A, the first end of the resistor R20 is connected to the first end of the resistor R21 and is connected to the first end of the triode Q1, the second ends of the resistor R21 and the triode are both grounded, the third end of the triode is connected to the first end of the light - emitting diode D3, the second end of the light - emitting diode D3 is connected to the first end of the resistor R6, and the second end of the resistor R6 is connected to a 3.8V voltage.

[0046] In practical applications, other devices such as relays and solenoid valves can be controlled by adding peripheral circuits.

[0047] The integrated basic peripherals include:

[0048] Sensors, which can include temperature sensors, humidity sensors, pressure sensors, photosensitive sensors, and motion sensors. Temperature sensors can be used to measure the ambient humidity; humidity sensors can be used to measure air humidity; pressure sensors can be used to measure air pressure or water pressure; photosensitive sensors can be used to detect light intensity; motion sensors can be used to detect motion or the presence of an object.

[0049] Audio devices, which can include microphones and speakers. Microphones can be used to collect ambient information; speakers can output sound information.

[0050] Storage devices, which can include Flash memories and EEPROM memories. A notable feature of Flash memories is their non-volatility, i.e., the data stored in them will not be lost when the power is off; the notable feature of EEPROM memories compared to Flash memories is that EEPROM has a lower storage density, usually a smaller capacity, ranging from dozens of kilobytes to hundreds of kilobytes, while Flash memories offer higher storage density and lower unit storage cost, with a capacity range from several megabytes to several gigabytes. The unit storage cost of EEPROM is higher and the read / write speed is slower. However, EEPROM has higher durability and is suitable for use under harsh power conditions, while Flash is more sensitive to power fluctuations.

[0051] Security peripherals, which can include encryption modules. Encryption modules can encrypt the data collected by sensors and store it in storage devices, and the encryption keys involved can also be stored in eSIM cards or USIM cards.

[0052] Display devices, which can also include LCDs (liquid crystal displays) and OLEDs (organic light-emitting diodes). LCDs can display text and images.

[0053] Such as Figure 10Schematic diagram of the integrated Mode working mode of the test terminal Cat.1. In the application scenario of collecting temperature information of a certain device at different time periods, the designed OpenCPU program is deployed in the USIM card. The functions of the OpenCPU program include: a function for implementing the function of reading sensor data, a function for implementing communication with a security peripheral, and a function for implementing the function of sending data to a cloud server. The test terminal transmits the data obtained by the temperature sensor to the security peripheral through the OpenCPU program and establishes a communication channel with the security peripheral. When the security peripheral encrypts the data, the test terminal sends the encrypted data to the cloud server through the Cat.1 module. In this way, the terminal is very convenient when testing the basic functions of OpenCPU because the OpenCPU test terminal integrates the most basic peripherals in the industry, without the need to perform wiring or soldering operations on the device, and the security of data transmission combined with the USIM card after encrypting the data through the security peripheral ensures a certain degree of security in the process of uploading the encrypted data to the cloud server.

[0054] The advantages of the USIM card compared to the SIM card are as follows. Firstly, the security of the USIM card is higher than that of the SIM card because of the two-way authentication between the USIM and the network. This authentication is not only user identity authentication but also network identity authentication, thus preventing unauthorized access and potential security risks. While the SIM card and the network adopt one-way authentication, that is, network identity authentication. The following explains user identity authentication and network identity authentication:

[0055] User identity authentication (user to network):

[0056] Start the authentication process: When a user device (such as a mobile phone) attempts to connect to the network, the network will request the device to provide authentication information.

[0057] Send a request: The network will send a random number to the user as the start of authentication.

[0058] Generate a response: The user uses the stored key and the received random number to generate a response value through an encryption algorithm.

[0059] Verify the response: The network uses the same key and random number to generate a response value.

[0060] Send the response: The network uses the same key and random number to generate an expected response value and compares it with the response value sent by the user.

[0061] Authentication result: If the two response values match, the network confirms that the user identity is legal and the authentication is successful; if they do not match, the authentication fails and the user cannot connect to the network.

[0062] Network identity authentication (network to user)

[0063] Network authentication: After successful user authentication, the user also needs to verify the network identity to ensure connection to the correct network rather than other networks, thus guaranteeing its security.

[0064] Using an additional response: During the authentication process, the additional response generated by the user can be used for network authentication. The network generates an expected additional response value based on the key shared with the user in advance.

[0065] Comparing the additional response values: The user compares the calculated additional response value with the additional response value provided by the network.

[0066] Confirming the network identity: If the additional response values match, the user confirms the legal identity of the network and can safely connect to the network; if they do not match, the USIM card will warn of the possible security and risks of the network.

[0067] Therefore, when using a SIM card to transmit data, if only the network authenticates the user's identity and the user does not authenticate the network identity, there may be a situation where when the test terminal equipped with the SIM card is connected to an illegal network, because the user does not authenticate the network identity and only the network authenticates the user's identity, the illegal network will allow the test terminal equipped with the SIM card to connect to the illegal network. As a result, data leakage may occur when the device uploads data, causing sensitive data to fall into the hands of lawbreakers.

[0068] The security peripheral can ensure that if there is a need for GPRS functionality (the USIM card does not support GPRS functionality), when the test terminal with a SIM card encounters the above situation and the key has not been leaked, the information security of the original data can still be guaranteed. Because when the test terminal with a SIM card is connected to an illegal network and encrypts data for transmission on the illegal network, lawbreakers must pay a huge cost in terms of time, equipment, etc. if they want to see the original data because they do not have the decryption key.

[0069] By setting up the security peripheral to encrypt data transmission and using the USIM card to transmit data, the security of data transmission of the OpenCPU test terminal is guaranteed.

[0070] The USIM card can support 4 concurrent logical services, support actively initiated multi-service applications, and is easy to perform value-added concurrency. In contrast, the SIM card is developed based on the card's operating system (OS), with relatively single functions, does not support multi-service applications actively initiated by the SIM card, and is not easy to perform value-added development.

[0071] In addition, the USIM card supports a richer STK logical channel compared to the SIM card, making it possible to actively initiate multiple services based on the USIM card.

[0072] Furthermore, compared with the SIM card, the access interface rate of the USIM card is greatly improved, and the card rate of the USIM card is also greatly improved, reaching about 230 Kbps, while the SIM card is only about 57 Kbps. This makes the USIM card more suitable for applications that require large data transmission.

[0073] In some embodiments, in the application scenario of testing the effect of industrial Internet of Things devices, the triode drive expansion interface on the OpenCPU test terminal is connected to the industrial Internet of Things device. The designed OpenCPU program is deployed on the USIM card or eSIM card. Different functions set by the OpenCPU are tested through the key array. The relevant data generated after the industrial Internet of Things device runs is collected by sensors. The test terminal obtains the data on the sensors through the set OpenCPU program, and transfers the data to the secure peripheral for encryption. The encrypted data is transmitted to the cloud server through the ANT antenna of the Cat.1 communication module. The LED display array can display the relevant data and effects of the device test in real time. When operating the industrial Internet of Things device through the OpenCPU test terminal, the device can be operated by using AT commands through serial port expansion, and debugging and LOG information can be viewed at the same time. The serial port expansion can also interact with the user MCU to develop more applications.

[0074] The advantages of the triode drive compared to the USB interface are as follows. The circuit design of the triode drive expansion interface is relatively simple, easy to implement and maintain. The USB interface needs to follow specific protocols and its design is relatively complex. The triode drive expansion interface can work better in a lower power consumption mode, which is suitable for battery-powered portable devices. The response speed of the triode drive expansion is faster than that of the USB response expansion, making it more suitable for occasions that require precise control of current and voltage. Moreover, the triode drive interface is more adaptable to harsh environments. The reason is that the structure of the triode drive interface is relatively simpler and can better withstand vibration and shock. While the USB drive interface is more likely to be damaged under vibration and shock due to its relatively complex connector design. The triode drive interface is easier to achieve good environmental sealing and does not require an exposed connector like the USB drive interface, which may be damaged by environmental factors such as dust and moisture. The triode drive interface can be flexibly designed according to needs to adapt to compact or special-shaped spaces, while the USB interface has standard size and shape requirements. The triode drive interface has better compatibility than the USB drive interface and can resist external electromagnetic interference, while the USB drive interface is more vulnerable to electromagnetic interference. The triode has a wider operating temperature range than the USB interface and is suitable for working in extremely cold or hot environments, while the USB interface may be more sensitive to temperature. Additionally, the power requirements of the triode drive interface are more lenient and can adapt to a wider voltage range, while the USB drive interface usually requires a stable power supply. Although the triode drive interface may have the above advantages in adapting to harsh environments, the USB interface has its unique advantages in data transfer rate, versatility, and ease of use. Therefore, the choice of which interface depends on specific application requirements and environmental conditions. In some applications that require high-speed data transfer and plug-and-play functions, the USB interface may still be a better choice. While in occasions with higher requirements for environmental adaptability, the triode drive interface may be more suitable. In summary, by combining the advantages of the triode drive expansion interface and the USB interface, the application scenarios of the OpenCPU test terminal are made more extensive.

[0075] In some embodiments, when the OpenCPU test terminal is disconnected from the network, it will enter the PMS working mode. In this working mode, only the RTC is working, the network is in a non-connected state and no longer accepts paging messages, and it can accept external wake-up. The power consumption in this working mode is relatively low, and the power consumption < 350uA.

[0076] In the encryption and decryption embodiment, during the data encryption process, the encryption method adopts asymmetric encryption, and the key K and the key Q generated by the key distribution server are respectively distributed to the OpenCPU test terminal and the server receiving the encrypted data, and the security peripheral on the OpenCPU test terminal uses an asymmetric encryption algorithm to encrypt the data according to the key K, and the encrypted data is sent to the server receiving the encrypted data through the Cat.1 communication module of the OpenCPU, and the original data is decrypted using the key Q. The advantage of this is that even if the key K is leaked or disclosed, it is difficult to restore the original data, thereby ensuring the security of the data.

[0077] The utility model deeply explains its purpose, technical scheme and beneficial effects through specific embodiments, but these embodiments are only used as examples to show the application mode of the invention and do not constitute a limitation on the protection scope of the invention. We explicitly point out that any reasonable modification, equivalent substitution or technical improvement under the guidance of the spirit and principles of the invention should be included in the protection scope of the utility model. This means that as long as these changes do not deviate from the core idea and basic function of the invention, they should be protected by patent rights. The scope of protection of the present invention should be broad, including all direct and obvious variants and non-obvious innovations that can be reasonably deduced by technical experts based on the disclosure of the present invention. This broad protection is intended to promote further research and development based on the present invention, while ensuring that its innovation and practicality are fully protected by law.

Claims

1. An OpenCPU test terminal, characterized in that the core communication module of the OpenCPU test terminal is a Cat.1 module, and the Cat.1 communication module is provided with a chip; an expansion drive module is connected to the MAIN series pins, DBG series pins and AUX series pins of the chip; a SIM card drive module is connected to the USIM series pins of the chip; a number of integrated peripherals are connected to the MAIN series pins, NET series pins and STATUS series pins of the chip.

2. The OpenCPU test terminal according to claim 1, wherein The SIM card drive module includes a SIM card socket J2. The second ends of three capacitors connected to the GND pin, VCC pin, RST pin and CLK pin of the socket J2 are grounded; the DATA pin of the socket J2 and the first end of the resistor connected thereto are connected to the USIM_DATA pin of the U2A chip; the CLK pin of the socket J2 is connected to the USIM_CLK pin of the chip; the RST pin of the socket J2 is connected to the USIM_RST pin of the chip; the VCC pin of the socket J2 is connected to the USIM_VCC pin of the chip.

3. The OpenCPU test terminal according to claim 1, characterized in that, The chip is connected to a SIM card drive module; the chip is connected to integrated peripherals; an LED array is connected to the chip; a key array is connected to the chip and the chip; the chip is connected to the expansion drive module; the chip is provided with a USB BOOT emergency download module.

4. The OpenCPU test terminal according to claim 2 or 3, characterized in that The expansion drive module includes a triode drive expansion and a serial port expansion.

5. The OpenCPU test terminal according to claim 4, characterized in that, The serial port expansion includes an AUX_UART expansion module and an AT download & Debug module.

6. The OpenCPU test terminal according to claim 5, wherein, The USIM_DATA pin, USIM_RST pin, USIM_CLK pin and USIM_VDD pin of the chip are connected to the SIM card drive module; the ANT_MAIN pin of the chip is connected to the first end of a resistor R2, the second end of the resistor R2 is connected to an ANT antenna J1, the second and fourth pins of the ANT antenna are grounded, the first end of a resistor R3 is connected to the second end of the resistor R2 and the second end of the resistor R3 is grounded; the NET_STATUS pin, MAIN_RI pin and STATUS pin of the chip are connected to integrated peripherals; the MAIN_TXD pin, MAIN_RXD pin, DBG_TXD pin and DBG_RXD pin of the chip are connected to the AT download & Debug module; the AUX_TXD pin and AUX_RXD pin of the chip are connected to the AUX_UART expansion module.

7. The OpenCPU test terminal according to claim 1 or 6, characterized in that, The USIM2_DATA pin, USIM2_RST pin and USIM_CLK pin of the chip can be used to connect to peripherals with different powers.

8. The OpenCPU test terminal according to claim 3, wherein The USB BOOT pin of the chip is connected to a USB BOOT emergency download module.

9. The OpenCPU test terminal according to claim 3, wherein The integrated peripherals are provided with a security peripheral, and the security peripheral can encrypt data, and its encryption method is asymmetric encryption.

10. The OpenCPU test terminal according to claim 1, wherein The chip model of the Cat.1 communication module is NT26K.

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