28 results about "Broadcast address" patented technology

The invention relates to the technical field of address allocation, in particular to an automatic discovery and dynamic address allocation method for 485 bus equipment, which comprises the following steps: a host verifies a broadcast address and transmits an instruction to a bus, captures a delay response of a slave to establish a response queue, analyzes dense signals and peels off conflict fragments, dynamically adjusts sampling to generate rhythm mapping, and sends the rhythm mapping to the slave; address instructions are issued according to the sequence, the slave machines check, update and return receipts, the host machine collects and generates an allocation table, monitors signal drift, adjusts time sequence parameters, reconfigures response time periods, updates a synchronization state and completes recording. According to the method, a mapping mechanism based on a broadcast response time sequence is established, stable node distinguishing is obtained through signal multi-dimensional analysis, independent extraction and sequence self-correction are achieved through differential allocation and dynamic sampling, a self-adaptive communication structure is constructed, unified recognition pairing and rhythm coordination are achieved in address allocation, and the self-organization capacity is remarkably improved; concurrency conflicts are reduced, precision is improved, and communication consistency and efficient automatic addressing in a dynamic environment are ensured.

A method includes broadcasting, by a powered wireless device, a survey request frame to a plurality of ambient (AMP) devices that harvest environmental energy, wherein the survey request frame comprises a unique public key to be used by each AMP device, of the plurality of AMP devices, to generate a survey response frame. The method includes using, within the survey request frame, a first random address as a source media access control (MAC) address and one of a broadcast address or a group address as a destination MAC address. The method includes determining, from each respective survey response frame, whether a corresponding AMP device of the plurality of AMP devices is accessible from which to securely obtain data.

To provide a device for real time dissemination of information or water level status to the community wherein they are at the forefront of the impending disaster. A portable water level monitoring device (1) comprising: a 10 microcontroller (11) connected to a MP3 module (12) with a memory card (12a); a plurality of sensors (13) connected to the microcontroller (11); a public address system (15) connected to the microcontroller (11) ;a broadcast address system (14) connected to the microcontroller (11); a power source system (16) connected to the microcontroller (11) and the plurality of sensors (13); wherein the microcontroller (11) 15 programmed the sensors (13) to collect data and transmit a water level to the public address system (15) and broadcast address system (14). A listening station configured to receive the collected data transmitted.

The invention discloses a method for realizing session synchronization by a multi-live load balancing system based on lvs, and relates to the field of cloud computing. Comprising the steps of (1) preparing computing resources and deploying load balancing nodes and real server nodes, (2) configuring a mode of issuing a route on a router and realizing an equivalent multi-path route, (3) configuring the load balancing nodes, selecting lvs as a load balancer and deploying by using a dr mode of the lvs, and (4) performing lvs session synchronization configuration, and after session synchronization configuration is completed, sending the load balancing nodes to the router. When a user requests to pass through one of the load balancing nodes, if the load balancing node completes TCP three-way handshake and connection is established, quintuple information of TCP connection and a session state are packaged into a lightweight synchronization message through the load balancing node. Sending the broadcast address to all load balancing nodes in the same cluster through the load balancing nodes according to a pre-configured broadcast address; according to the method, a load balancing node receiving a synchronous message firstly searches whether a connrack table item of the same quintuple exists in the local, if not, a new connection tracking record is directly inserted, and if yes, a strategy merging state is updated by using a later uncovered or timestamp, so that the whole cluster is ensured to be completely consistent with a view of the long connection.

The application relates to the field of multi-mode communication, in particular to a communication data management system and method based on a multi-mode network, which comprises a fading sampling module, a channel modeling module, an optical fiber transmission module, a link gain module and a channel solidification module, the fading sampling module is used for collecting pilot signals, the channel modeling module is used for calculating signal loss and constructing a channel model, the optical fiber transmission module is used for setting an optical fiber repeating antenna to perform cross-area signal repeating, the link gain module is used for broadcasting addressing signals, and the channel solidification module is used for solidifying a signal communication mode; the application can help to optimize receiver antenna design, reduce the error code phenomenon caused by signal fading, realize cross-blank area communication under a wireless signal shielding state, construct a three-dimensional communication network, improve the performance, reliability and applicability of a communication system, simultaneously realize dynamic resource scheduling, guarantee communication link stability and reduce the probability of communication interruption.

A method includes determining, by an ambient power (AMP) device that harvests environmental energy, one or more first authentication and key management (AKM) parameters. The method includes broadcasting, to powered wireless devices, an initialization request frame including one or more frame-exchange parameters, the one or more first AKM parameters, and encrypted content with which a powered wireless device of the powered wireless devices is to establish an encrypted wireless communication session with the AMP device. The content that was encrypted can include an identifier of the AMP device that is also known to the powered wireless device. The method includes using, by the AMP device within the initialization request frame, a first random address as a source media access control (MAC) address and one of a broadcast address or a group address as a destination MAC address.

The application relates to a live broadcast control method and device, a video cloud platform and a storage medium, wherein the live broadcast control method comprises the following steps: in response to a video playing request of a client for a target live broadcast address, collecting traffic distribution data and client information based on the video playing request, and counting live broadcast traffic of the target live broadcast address according to the traffic distribution data and the client information to obtain a traffic counting result; and performing access control on the video playing request based on preset live broadcast configuration information and the traffic counting result. The video cloud platform completes counting of live broadcast traffic, reduces the dependence on the data reported by the client, avoids the problem that the traffic counting result is maliciously tampered with, and thus the credibility of the traffic counting information is improved.

The invention provides a system and a method for realizing signal synchronization of a fire sound and / or light alarm, and relates to the field of fire alarm. The method comprises the following steps: establishing a broadcast communication mechanism based on event driving, when a host detects a fire event, generating an instruction frame of which a target address is a broadcast address, defining an alternate control field, and sending the instruction frame to all slaves in a broadcast form; enabling all on-line slaves to receive and analyze the instruction frame at the same time, calculating a transmission delay compensation value, adjusting local trigger time by combining an annular loop and a signal conditioning circuit, and calculating an alternating trigger time point of sound and light alarm and emergency broadcast based on an analyzed alternating control field; and all the slaves execute the starting, stopping or alternate switching operation based on the alternate control field of the sound and light alarm according to the function code at the adjusted trigger time point. The technical problems that synchronous starting or stopping of multiple devices is delayed, and the switching process of all links in operation is disjointed are solved.

The application relates to the technical field of address allocation, in particular to a 485 bus equipment automatic discovery and dynamic address allocation method, wherein a host verifies a broadcast address and transmits an instruction to a bus, a slave time-delay response is captured to establish a response queue, intensive signals are analyzed and conflict fragments are stripped, a sampling generation rhythm map is dynamically adjusted, an address instruction is issued according to sequencing, the slave checks and updates and returns a feedback, the host collects and generates an allocation table, signal drift is monitored and timing parameters are adjusted, a response period is reconfigured, a synchronization state is updated and record is completed. According to the application, a mapping mechanism based on broadcast response timing is established, stable node differentiation is obtained through multi-dimensional signal analysis, independent extraction and sequence self-checking are realized through differentiated allocation and dynamic sampling, an adaptive communication structure is constructed, pairing and rhythm coordination are uniformly identified in address allocation, self-organizing capability is significantly improved, concurrent conflict is reduced and precision is improved, and communication consistency and efficient automatic addressing in a dynamic environment are ensured.

The application provides a communication method, device, equipment, storage medium and program product, and relates to the technical field of communication. The method comprises the following steps: receiving a first message sent by an access network device, wherein the first message comprises a first address of the access network device and a type of the first message; broadcasting the first message, and storing the first address of the access network device based on the type of the first message; receiving a second message sent by a terminal device, and determining the type of the second message, wherein a target address of the second message is a broadcast address; when the type of the second message indicates that the second message is used for finding the access network device, modifying the target address of the second message into the first address; and sending the second message based on the first address.

The invention relates to the field of device burning, in particular to a batch device burning method, system and device based on uboot, comprising: monitoring a predefined broadcast address to receive a broadcast message; determining a network address of a burning device corresponding to the broadcast message according to the received broadcast message; sending burnt file information to the network address; monitoring a predefined file transmission port to receive a file transmission request; analyzing the file transmission request to obtain a corresponding transmission address and a burnt file identifier; and sending the burning file corresponding to the burning file identifier to the transmission address. According to the method and the device, the full-process automation from device discovery, metadata issuing to file transmission is realized, so that one server can simultaneously carry out burning operation on dozens of even hundreds of devices in a network in parallel, the production efficiency of batch device burning is greatly improved, and the time and labor cost required by mass production is remarkably reduced.

A method includes broadcasting, by a powered wireless device, a survey request frame to a plurality of ambient (AMP) devices that harvest environmental energy, wherein the survey request frame comprises a unique public key to be used by each AMP device, of the plurality of AMP devices, to generate a survey response frame. The method includes using, within the survey request frame, a first random address as a source media access control (MAC) address and one of a broadcast address or a group address as a destination MAC address. The method includes determining, from each respective survey response frame, whether a corresponding AMP device of the plurality of AMP devices is accessible from which to securely obtain data.

The invention provides a dynamic address allocation method based on a link layer protocol, which is used for a scene that a plurality of hosts are connected with an address allocation server through switching equipment, and comprises the following steps: S10, the address allocation server establishes an available IP address pool and an allocated IP address record table; s20, the address allocation server periodically broadcasts the survival broadcast message of the address allocation server, and informs the connected host of the MAC address of the address allocation server; s30, the host encapsulates the MAC address in a link layer IP address allocation request message and sends the message to an address allocation server; s40, the address allocation server traverses the allocated IP address record table, randomly selects an available IP from the available IP address pool, and sends a link layer IP address allocation response message to the request host by using a link layer IP address allocation protocol; and S50, after receiving the link layer IP address allocation response message, the host sets the own IP address, the gateway and the subnet mask according to the content of the message. And IP address allocation is realized efficiently and reliably.

This invention provides a distributed IoT system with fiber optic networking and its device registration method. The system includes a host computer, a switch, and IoT terminal devices. The switch is connected to the host computer. Each IoT terminal device is equipped with two fiber optic interfaces. The IoT terminal devices are connected to the backbone network in a daisy-chain manner through the fiber optic interfaces, enabling bidirectional data communication along the cascaded path of the IoT terminal devices. Each device joins a unified multicast via a distributed soft bus component. The host computer sends multicast messages to all IoT terminal devices in the system via the CoAP protocol or sends messages to specific IoT terminal devices based on their IP addresses. The IoT terminal devices identify the destination address carried in the messages and parse and respond to messages whose destination address is their own IP address or the multicast address. This invention uses a daisy-chain fiber optic connection to form a mesh network system between the terminals and the host computer system, allowing each node to communicate with each other at high speed and low latency.

The application discloses a hardware implementation device of a high-throughput rate forwarding table for unicast and multicast, which improves the resource utilization of the circuit by performing the switching of unicast and multicast and broadcast of the data link layer in one path. In addition, the device adopts a full-pipe structure, adopts one port for searching the forwarding port result, and adopts another port for accessing the self-learning and self-aging at the same time of searching, and stores the read-write control signals which fail to access in time in a FIFO, the port is used for the configuration of the control layer at the initial time of the system, allows processing data once per cycle, and more greatly improves the throughput rate. The two-layer forwarding of the application only uses one forwarding table to record the mapping relationship between the unicast broadcast MAC address and the output port, the mapping relationship between the multicast MAC address and the multicast group member, synchronizes the updating functions of the self-learning and self-aging in the forwarding table in time, and improves the storage resource utilization.

A bit mask mode broadcast addressing method of a light string with a power carrier having an address code adopts a mode selection code definition to enter a bit mask mode, presented data is used for specifying which bits in an address are matched or neglected, and flexible matching of a target address is realized by controlling a specific bit field of a network address through a bit mask; according to the method, the lamp beads with the address codes consistent with the template bits are selected, other bits, not consistent with the template bits, in the same group of data can be in any state, and selection of the lamp beads consistent and corresponding to the bit masks is not affected; the broadcasting function is started while the bit mask mode is entered, all the lamp bead combinations matched with the state of the bit mask play all the lamp beads in a broadcasting mode, the corresponding mask positions execute color data of the data protocol, and the lamp beads consistent with the specific mask positions can demonstrate the data of the color combinations, namely the same color is played synchronously. Compared with the prior art, the method has the advantages that the data size is small, and the updating rate is not limited.

The application provides an offline device fault diagnosis method and device, the method comprising: determining a networking fault device existing in neighbor devices in a same local area network with an autonomous mobile device; determining a broadcast address of the networking fault device based on a preset neighbor device table; scanning a broadcast signal corresponding to the broadcast address in a moving process of the autonomous mobile device; and establishing a connection with the networking fault device and determining fault information of the networking fault device when the broadcast signal is scanned in a single moving cycle. It can be seen that the implementation can automatically determine an offline device and determine an offline reason of the offline device, thereby realizing positioning and effective diagnosis of the offline device.

A method comprises broadcasting, through a powered wireless device, a query request frame to a plurality of ambient power devices (AMP devices) that absorb ambient power, wherein the query request frame includes a unique public key that is to be used by each AMP device of the plurality of AMP devices to generate a query response frame. The method comprises using, within the query request frame, an initial random address as a media access control source address (MAC source address) and a broadcast address or group address as a MAC destination address. The method comprises determining, from each query response frame, whether a corresponding AMP device of the plurality of AMP devices is accessible from which data can be securely obtained.

A method includes determining, by an ambient power (AMP) device that harvests environmental energy, one or more first authentication and key management (AKM) parameters. The method includes broadcasting, to powered wireless devices, an initialization request frame including one or more frame-exchange parameters, the one or more first AKM parameters, and encrypted content with which a powered wireless device of the powered wireless devices is to establish an encrypted wireless communication session with the AMP device. The content that was encrypted can include an identifier of the AMP device that is also known to the powered wireless device. The method includes using, by the AMP device within the initialization request frame, a first random address as a source media access control (MAC) address and one of a broadcast address or a group address as a destination MAC address.

To provide a radio communication system capable of sensing a plurality of slave units at the same time or at an arbitrary designated time.SOLUTION: The wireless communication sensor system 1 includes a plurality of slave units 20a, 20b, 20c,., 20n driven by a battery, and a master unit 10 for performing wireless communication with the plurality of slave units. Each of the plurality of slave devices 20 includes a timer for setting the time information received from the master device 10, each of the plurality of slave devices 20 enters a sleep state according to the time information set in the timer, and the master device 10 can sequentially access the slave devices in synchronization with wake-up from the sleep state. A master unit 10 transmits a timer setting command for setting a wake-up time for simultaneously waking up each of a plurality of slave units to a timer to all the slave units 20 by a broadcast address.SELECTED DRAWING: Figure 1

The invention relates to the technical field of communication, in particular to a communication address automatic allocation method and system and electronic equipment, and the method comprises the steps that a host broadcasts a discovery message to a plurality of slaves, and the discovery message carries a preset communication address, a discrimination bit and a reference identity identifier; a reply message is received and analyzed, an analysis result is obtained, and the reply message is a message sent after the slave which meets the size relation specified by the judgment bit and is not distributed with the communication address receives the discovery message. And if the analysis result indicates that the reply message is from one slave, broadcasting the address allocation message. And if the analysis result indicates that the reply message comes from the at least two slaves, updating the reference identity identifier in the discovery message, and skipping to execute the step of broadcasting the discovery message to the plurality of slaves. The communication addresses of the slaves are automatically allocated, and the communication address allocation efficiency is improved. And in an expansibility scene, readdressing is not needed, so that the method has good network expansibility.

The embodiment of the invention provides a slave address allocation method and device and electronic equipment, and the method comprises the steps: broadcasting an address negotiation command to all slaves in a bus network, and enabling the bus network to comprise an address allocation host and a plurality of slaves; receiving response packets returned by the plurality of slaves according to a differentiated time sequence in response to the address negotiation command under a preset condition, wherein each response packet comprises a random number and intention information representing address intention; the random numbers of the response packets are distinguished from one another, and the random numbers are pre-generated and stored in the slaves; for each response packet, determining an allocation address corresponding to each random number according to the intention information; and multiple groups of distribution information are broadcasted in the bus network, and each group of distribution information comprises each random number and a corresponding distribution address, so that each slave determines the corresponding distribution address according to the pre-stored random number and the random number in the distribution information.

This application discloses a method, apparatus, Bluetooth device, and storage medium for determining whether a server provides services. This allows for the implementation of a database hash feature value function for a generic attribute protocol service even when the server's broadcast address on a low-power Bluetooth device is a random address, thereby reducing redundant data interaction and optimizing device connection speed. The method includes: when the Bluetooth device connects to a server, if the server's broadcast address is a random address, obtaining the server's unique identifier and current hash value; searching for locally stored historical hash values ​​based on the unique identifier; if the current hash value and the historical hash value are consistent, determining that the service provided by the server has not changed, and stopping the search for the service provided by the server.

The present disclosure provides a wireless device, a communication method thereof, and a computer program product. The communication method of the wireless device comprises the following steps: receiving a wireless message; judging whether the wireless message is a forged message based on whether the target MAC address of the wireless message is a broadcast MAC address or a multicast MAC address and whether the target IP address of the wireless message is a unicast IP address; and in response to the fact that the wireless message is a forged message, discarding the wireless message.

The invention discloses a QEMU-based 1553B bus chip simulation communication implementation method, which belongs to the field of bus simulation, and is characterized in that a plurality of virtual interface control chip models supporting a 1553B bus protocol are constructed based on a QEMU virtualization platform, each chip is respectively accessed to virtual network bridges of different subnets of a host machine through two independent TAP interfaces, a dual-redundancy bus broadcast domain is simulated, and the virtual interface control chip models support the 1553B bus protocol; the chip is internally provided with a configuration register, a storage working mode (BC / RT / MT) and RT address parameters, the parameters can be read to dynamically switch the working mode, when the working mode is set to be the RT mode, the chip forms an RT instance, reads an RT address, combines a preset routing table and is bound to two virtual network bridges at the same time, the chip receives and transmits data at a corresponding subnet broadcast address through a Socket UDP broadcast mechanism, and the data is sent to the corresponding subnet broadcast address. And multi-terminal data interaction in a stand-alone virtual environment is completed by means of a host machine Linux kernel broadcast loopback characteristic.

The invention relates to a clothes airing machine control method, system and device and a storage medium, and the method comprises the steps: entering a broadcast message scanning state, and receiving a first broadcast message in a preset broadcast channel; wherein the first broadcast message comprises an identification field, a broadcast address and an effective data segment; identifying and filtering the plurality of first broadcast messages to obtain a second broadcast message; analyzing the second broadcast message, and obtaining a control instruction from the second broadcast message; and controlling the clothes airing machine to execute corresponding actions according to the control instruction. According to the method provided by the invention, through the broadcast message of the remote control terminal and the mode of identifying and filtering the message by the clothes airing machine, pairing-free control on the clothes airing machine is realized, the system power consumption is reduced, the control complexity is reduced, and the interaction freedom degree and the user experience are improved.

This invention relates to the field of power equipment technology, specifically to a self-identification method and system based on the MODBUS serial communication protocol. The method includes: a numbering module for sequentially numbering all slave addresses; a broadcast addressing module for sending broadcast addressing commands from the master station to the corresponding slave stations connected to the bus; an unaddressed module for sending unaddressed commands from the master station to the corresponding slave stations not connected to the bus; a random address encoding module for sending random address encoding commands to multiple slave stations with the same address number; and a slave station response module for enabling the slave stations to respond according to the corresponding commands received from the broadcast addressing module, the unaddressed module, and the random address module. This invention transforms the process of manually configuring master and slave information, which previously required technicians, into a self-identifying process for both master and slave stations, reducing the configuration work for technicians and preventing communication anomalies caused by configuration errors.

A method comprises determining, by means of an ambient power supply (AMP device) absorbing ambient power, one or more first authentication and key management parameters (AKM parameters). The method includes broadcasting to powered wireless devices an initialization request frame comprising one or more frame exchange parameters, the one or more first AKM parameters, and encrypted content with which a powered wireless device is to establish an encrypted wireless communication session with the AMP device. The encrypted content may include an identifier of the AMP device, which is also known to the powered wireless device.The procedure involves using, through the AMP device within the initialization request framework, an initial random address as a Media Access Control source address (MAC source address) and one from a broadcast address or a group address as a MAC destination address.