175 results about "Broadcast packet" patented technology

Systems and methods are described for transmitting broadcasts by Peripherals, receiving the broadcasts by Centrals, and communicating with a Backend by Centrals. Specifically, a Peripheral may generate and transmit an encrypted broadcast packet to a Central, the Central may transmit the encrypted observation information to the Backend, which may decrypt the broadcast packet. Additionally, a Central may transmit a request for authorization to connect to a Peripheral to the Backend. If authorized by the Backend, the Central may connect to the Peripheral. Further, a Central may receive a plurality of broadcasts over a period of time. The Central may store information about the broadcasts and, at the conclusion of the period of time, transmit the information about the broadcasts and the last-received broadcast to the Backend.

The invention discloses a method, a system, equipment and a medium for constructing a special area ad hoc network for a small hydropower station in a mountainous area, and relates to the technical field of area ad hoc networks, and the method comprises the steps: selecting an initial node in the small hydropower station as a network initiating node, setting the initial node as a backbone node after starting, and starting a broadcast control signaling to form a virtual backbone network; other nodes enter a non-network-access state after being started, periodically send a state broadcast packet to search the backbone node, and if the backbone node is detected, complete network access authentication and join the network to become a non-backbone node; non-backbone nodes joining the network enter an active state in a preset period so as to assist other nodes which do not access the network to complete search and access; and when the network topology changes, the connection of the virtual backbone link is kept through a bridging mechanism. According to the method, the virtual backbone communication network with the characteristics of high reliability, high expandability and low energy consumption can be quickly constructed in a complex mountain environment which lacks public network coverage and is unstable in communication link.

A topology information update method includes a first node that sends a first packet in a broadcast manner, receives a second packet from a second node, where the second packet is a broadcast packet, and the first packet and the second packet each carry an identity identifier, a topology identifier, and a synchronization radius identifier that are of the respective node. The first node determines, based on the first packet and the second packet, whether the first node and the second node need to synchronize topology information.

The invention discloses a device and a method for accurately detecting mobile equipment based on Bluetooth features, and the method comprises the steps: carrying out the signal capture of the mobile equipment through an existing Bluetooth communication protocol in the mobile equipment; basic verification and deduplication are carried out on the captured Bluetooth data, and accurate timestamps and received signal strength (RSSI) information are given to the data; filtering a data organization unique identifier (OUI) in a broadcast packet of the mobile device in real time; analyzing a specific field in a broadcast packet of the mobile equipment, and identifying a specific broadcast mode of the type equipment; a dynamic fingerprint database is constructed, and a false alarm firewall is formed by associating a signal intensity curve with broadcast interval stability; if the same fingerprint is captured in three continuous scanning periods and the signal intensity is greater than a preset value, triggering existence judgment; according to the invention, through mutual cooperation of the modules, zero-interaction passive monitoring of the mobile device is realized, the identification precision is high, and the false alarm rate is extremely low.

A wireless communication method includes: obtaining subnet information of a first subnet corresponding to a first session; receiving a data packet, where the data packet is a multicast packet or a broadcast packet; determining, based on the subnet information, that the data packet corresponds to the first session in the first subnet; and sending the data packet via the first session.

The invention discloses a low-power-consumption adaptive broadcast adjustment method and system, and the method comprises the steps: building a physical model based on the physical characteristics of equipment, and simulating the influence of a broadcast interval and a scanning interval on energy consumption and connection time delay; generating a training data set based on the physical model, and training a proxy prediction model, so as to predict an optimal broadcast interval and a scanning interval according to the service priority, the electric quantity state, the connection time period and the environment equipment density; monitoring the operation state of the equipment, and correcting the input parameters of the proxy prediction model according to the battery attenuation factor and the antenna aging factor; triggering the updating of the proxy prediction model according to the broadcast packet loss rate and the electric quantity change; the connection time period is predicted based on the historical connection data, the input weight of the proxy prediction model is adjusted to adapt to different connection load scenes, and the connection reliability and scene adaptability are improved.

The invention relates to a multi-terminal offline media synchronous playing method and system in a local area network. The multi-terminal offline media synchronous playing method in the local area network comprises the following steps: performing master-slave election on all terminals, and confirming a master device and a plurality of slave devices; performing clock synchronization on the master device and all the slave devices; packaging the synchronized playing progress of the master device to form a master device broadcast data packet, and sending the master device broadcast data packet to all slave devices; after the slave device analyzes the time delay and play delay, time delay and play delay are calculated respectively, and network time delay and progress errors are obtained; whether the absolute value progress error of the current slave device exceeds an error threshold value or not is judged; if not, the master device continues to broadcast the data packet; and if yes, pre-estimated target frame correction is carried out on the slave device, and playing progress synchronization of the slave device is completed. According to the multi-terminal off-line media synchronous playing method in the local area network, the dependence of the server is effectively reduced, and the playing progress synchronization precision is remarkably improved.

This application provides a method and device for achieving fast traffic convergence. The method includes: selecting a primary next hop and a backup next hop from multiple next hops in a VXLAN tunnel based on the device type; setting the primary next hop to a forwarding state and the backup next hop to a discard state in the multicast table entry of the VXLAN tunnel; registering a port close event for the VXLAN tunnel; forwarding broadcast packets, unknown unicast packets, and multicast packets within the virtual forwarding instance through the primary next hop of the VXLAN tunnel; and when a port close event is received from the outgoing port of the primary next hop, setting the primary next hop to a discard state and setting the backup next hop to a forwarding state.

A low-power Bluetooth key control method and system based on multimodal perception, relating to the field of Bluetooth keys, is disclosed. The method includes: The vehicle end determines the parking environment type using multi-source sensor data such as GPS signal strength, ambient light intensity, and the number of nearby Bluetooth devices, encoding this data into an environment identification code. This code, along with vehicle status information such as door lock status and the last unlock timestamp, is encapsulated in a Bluetooth broadcast packet and broadcast. The key end receives and parses the environment identification code, retrieving the corresponding target weight vector (including RSSI, motion state, and ranging accuracy weight coefficients) from a pre-stored database. The key end collects multi-dimensional feature parameters such as the current RSSI value, motion state, and CS ranging distance value, calculating the RSSI matching score, motion matching score, and ranging reliability score respectively. These are then combined with the target weight vector to calculate the unlock confidence score. A tiered unlocking strategy is executed based on the score's range. Implementing this method can improve the accuracy of Bluetooth car key unlocking judgment.

The invention discloses an identity recognition information generation method and device of Bluetooth equipment and electronic equipment, and relates to the technical field of electromagnetic supervision safety, and the method comprises the steps: determining a broadcast event interval and an interval type according to a timestamp sequence of a broadcast packet; determining a broadcast event interval parameter, a broadcast delay generation parameter and a time drift value according to the broadcast event interval and the jump discontinuity point in the interval category; and obtaining the identity recognition information of the Bluetooth equipment by combining the parameters. The problems that identity recognition information generated according to load information is prone to failure or counterfeiting and poor in safety, and identity recognition information generated according to the characteristics of data packet signals is low in accuracy and poor in stability can be solved. According to the method, broadcast event interval parameters are extracted from an application layer, broadcast delay generation parameters are extracted from a protocol layer, time drift values are extracted from a hardware layer, cross-layer fingerprints are jointly formed to serve as identity recognition information, the identity recognition information has long-term stability, and accurate, stable and repeatable recognition can be conducted on Bluetooth equipment.

This application relates to the field of IoT smart devices and provides a method for linking a pet collar and a feeder. The method includes: controlling the pet collar as a Bluetooth beacon to broadcast data packets with a preset transmission power and preset period; controlling the feeder to initiate Bluetooth passive scanning, listening to the broadcast channel according to preset scanning parameters, and performing format filtering and signal strength value threshold filtering after receiving data packets; storing the media access control address, signal strength value, and timestamp of the corresponding pet collar into a local fixed-capacity circular buffer queue after the format filtering and threshold filtering are passed; controlling the feeder to perform verification at a preset period, clearing historical data exceeding a preset valid duration in the circular buffer queue; when all data corresponding to the pet collar in the circular buffer queue is cleared, determining that the pet has left the area, reporting a record containing the corresponding media access control address, current UTC, and cumulative presence time, and triggering a preset linkage action.

The application provides a kind of unmanned plane anonymous authentication and identity remote identification method, unmanned plane and its supervision equipment, the method includes: by unmanned plane service provider in advance selecting system main private key and main public key, define attribute set;And by unmanned plane registration process, generate and issue certificate for the unmanned plane;Unmanned plane running process, generate RID data packet that can be anonymous authentication and meet RID rule;RID data packet includes the following information: unmanned plane position, unmanned plane speed, unmanned plane attribute ciphertext, unmanned plane operator's location ciphertext, encrypted unmanned plane public key information, time stamp, group signature;Timing broadcast RID data packet, so that receiver obtains the position and flight speed of unmanned plane according to the received RID data packet. Utilize the scheme of the application, the effective management and privacy protection of unmanned plane can be realized.

This invention discloses a method, apparatus, and system for sending broadcast data packets longer than a preset length to a group. The method includes: when there are broadcast data packets longer than a preset length to be sent to the group, splitting the broadcast data packets to be sent into multiple sub-data packets; determining the number of transmission time slot groups required to send the broadcast data packets to be sent; dividing the sub-data packets into multiple subgroups according to the number of groups; a transmission synchronization frame in one cycle includes one set of transmission time slots, each time slot accommodating one subgroup of data packets; all sub-data packets contained in all time slots corresponding to each data packet to be sent constitute one set of data packets; sending a synchronization frame header indication packet for that set at the beginning of each transmission time slot, indicating that multiple sub-data packets will be sent consecutively thereafter; and sending the sub-data packets to the group within the time slots of different subgroups corresponding to each cycle. This invention can efficiently send broadcast data packets longer than a preset length to a group in high-density wireless communication scenarios.

This system enables stable communication between devices that do not have the functionality to simultaneously send and scan advertisement packets, even if the peripheral and central roles are not predetermined. [Solution] The electronic device includes a control unit 110 that, when establishing a communication connection via BLE, performs a first operation which involves repeatedly sending an advertisement packet and scanning for advertisement packets at a set interval, acquires first information by a first method which is capable of obtaining different values ​​for each device, and changes the interval of the first operation based on the first information while the first operation is being performed.

This application provides a method and device for proxying and forwarding ring network data packets. The method includes: setting up two RPR ports connected to an adjacent node in the RPR ring network and a proxy RPR port connected to a proxy node via a direct RPR link for an RPR logical port; when the collected RPR ring network topology does not include a proxy node, announcing the proxy node to other nodes in the current RPR ring network topology; announcing the nodes in the current RPR ring network topology to the proxy node via the direct RPR link; recording the outgoing interface of the proxy node in the RPR ring selection table as a proxy RPR port; updating the outgoing interface of the RPR broadcast table to the normal RPR port and the proxy RPR port; and based on the updated RPR broadcast table, sending the first RPR broadcast packets forwarded on the ring by each node other than the proxy node to the proxy node through the RPR proxy port.

The invention relates to the technical field of low-power-consumption temperature anomaly alarm based on wireless communication, and discloses a low-power-consumption temperature anomaly alarm method and device based on wireless communication and a medium, and the method comprises the steps: collecting temperature data of a plurality of time points, generating a target feature based on a preset feature extraction method, the method achieves the comprehensive judgment of the key characteristics, such as the temperature trend and the change rate, can remarkably improve the alarm accuracy compared with a conventional single-point threshold value method, and generates a broadcast packet and executes Bluetooth low-power-consumption broadcast when the target characteristic reaches the alarm threshold value. The method has the beneficial effects that the alarm can be completed without maintaining Bluetooth connection, so that the problem of high power consumption caused by continuous connection in a traditional scheme is thoroughly solved, and the equipment can still quickly give out a temperature abnormity alarm under the condition that a mobile phone is not on the scene or the connection is disconnected.

The invention relates to a lighting control method and device for safe production, equipment and a medium, and the method comprises the steps: carrying out the network access configuration of each lighting equipment as a node, so as to construct a Mesh network, and building the bidirectional communication between the Mesh network and a terminal; the Mesh network obtains sensing data in the node area through a built-in sensor of the lighting equipment, and uploads the sensing data to the terminal; the terminal presets a first function strategy of the target lighting equipment, generates a function instruction corresponding to a second function strategy based on the received sensing data, and issues the function instruction to the Mesh network, the function instruction comprising at least one function of lighting control or safety early warning; a first node in the Mesh network receives a packaged broadcast packet containing a function instruction, the packaged broadcast packet is a broadcast packet sent by an agent node and / or a second node which has received the packaged broadcast packet, and at least one target lighting device is determined from the first node and the second node to execute the function instruction according to a preset multicast address of the node.

The invention provides a group control method based on a wireless expansion broadcast technology, and relates to the technical field of wireless communication. The method is applied to a group control system, and comprises the following steps: a mobile terminal sends a broadcast packet to a node device, the node device being a sub-device in a sub-device group; after acquiring the broadcast packet, the node equipment broadcasts the broadcast packet to other sub-equipment in the sub-equipment group; the broadcast packets comprise a first broadcast packet and a second broadcast packet, the first broadcast packet is a basic broadcast packet, the second broadcast packet is an extended broadcast packet, and the second broadcast packet comprises a group control instruction; the sub-equipment acquires a second broadcast packet based on the first broadcast packet after acquiring the first broadcast packet, and extracts a corresponding control instruction from the second broadcast packet; and the sub-equipment in the sub-equipment group responds to the control instruction to execute corresponding operation. According to the method, the transmission efficiency is improved, and the real-time performance and the consistency of sub-device group control are improved.

The invention provides a wireless audio data transmission method and related equipment, relates to the technical field of wireless audio, and is applied to a sending equipment group, and sending equipment in the sending equipment group broadcasts and communicates with N receiving equipment in continuous equal time intervals so as to transmit audio streams, when the sending device group comprises a master sending device and M slave sending devices which are in clock synchronization with the master sending device, the method comprises the following steps: in the equal time interval, the master sending device sends a first broadcast data packet to the N receiving devices based on a first communication link group, and / or in the M slave sending devices, the M slave sending devices send a second broadcast data packet to the N receiving devices based on a second communication link group. At least one slave sending device sends a corresponding second broadcast data packet to the N receiving devices based on the corresponding second communication link group; the first broadcast data packet generated based on the same audio frame and any second broadcast data packet carry the same audio data. According to the invention, the reliability of the audio stream in the transmission process can be improved.

The invention provides a self-adaptive network distribution method and device based on dynamic RSSI (Received Signal Strength Indicator) verification, and belongs to the technical field of intelligent equipment network distribution. Comprising the following steps: receiving a UDP broadcast packet sent by a mobile terminal, acquiring a first RSSI value of the UDP broadcast packet by monitoring the RSSI of the UDP broadcast packet, and performing preliminary verification on the first RSSI value; performing integrity verification on the UDP broadcast packet which passes the RSSI preliminary verification; and calculating a variance of a second RSSI value for the plurality of UDP broadcast packets passing the integrity verification, and determining WiFi configuration information for analyzing the UDP broadcast packets according to the variance of the second RSSI value to perform network distribution. Therefore, on the basis of preliminary verification and integrity verification of the UDP broadcast packet, network distribution is performed after the UDP broadcast packet is analyzed. The problem that an existing Smartconfig network distribution technology is prone to being interfered in a complex wireless environment is solved, the anti-interference capacity can be improved, and then the network distribution success rate and efficiency of intelligent equipment are improved.

The invention relates to a resource decoupling system applied to a data center and a response method. The system comprises a plurality of resource pools of different resource types and a management module, and each resource pool comprises a plurality of resource entities and an interconnection controller for providing data communication services for the resource entities; the management module is in communication connection with each interconnection controller and is used for carrying out resource detection on each resource entity by adopting a broadcast packet in a set format, creating an independent address mapping table for each resource type and carrying out dynamic maintenance according to a resource detection result; meanwhile, mutual access among different resource entities is coordinated through a command with a set format; and each interconnection controller caches a part of the address mapping table locally so as to accelerate the address searching process during resource request. The invention also provides a method for carrying out resource request and response among the resource entities in the system. According to the invention, network-centered resource decoupling can be realized, and the delay of mutual access between different resource entities is reduced.

A broadcast packet transmission method and system, device, storage medium and computer program product, the method comprising: acquiring a link layer data packet, the link layer data packet comprising a target data unit for repeated transmission; performing copy coding processing, coding the target data units into physical layer intervals, and obtaining a plurality of physical layer intervals respectively carrying the same target data unit information as repeated intervals; a plurality of repetition intervals are sequentially transmitted. According to the invention, the robustness of broadcast packet transmission can be improved.

The invention provides a time synchronization method, device and system of a master device and a slave device, computer equipment and a storage medium, and relates to the technical field of wireless transmission, the master device sends a first broadcast packet to the slave device, the first broadcast packet is sent only once, and therefore it is ensured that when the time difference between the master device and the slave device is calculated, the time difference between the master device and the slave device is calculated. The time difference is corresponding to receiving and transmitting of the same broadcast packet, and when the propagation time of electromagnetic waves between two devices is ignored, the time related to the time difference corresponds to the same world time, so that the system time of the slave device can be accurately calculated; the clock synchronization updating between the master device and the slave device can be completed under the condition of considering broadcast delay.

The invention discloses an intelligent management system and method applied to an information technology service platform, and relates to the technical field of big data analysis. A data transmission path table is constructed by obtaining a total historical data transmission path of the information technology service platform and relying on a unique identifier of a path node; according to the method, standardized archiving and accurate retrieval management of paths are realized, the problems of time sequence overlapping and transmission conflicts of pheromone broadcast packets are avoided, and reliable data support is provided for platform operation. An independent first pheromone broadcast packet spontaneous period is configured based on path table data analysis in combination with broadcast packet duration, the defects of response lag and tedious operation are overcome, and it is guaranteed that pheromones are synchronized and ordered. And a second broadcast period is dynamically adjusted and configured by comparing predicted pheromone concentration with a threshold value, path increase and decrease and a state change scene are adapted, the problem of state perception distortion after path change is solved, and accurate management and control and stable operation of a platform data transmission path are realized.

The invention discloses a working method and device of a wireless network system, electronic equipment and a medium, and relates to the technical field of wireless networks. The method comprises the following steps: sending a broadcast packet at a Mode 1, wherein the broadcast packet comprises an available channel ID; receiving a connection request sent by the master device to be connected after the master device scans the broadcast packet at the Mode 1; the connection request comprises a target channel ID determined by the to-be-connected main equipment in the available channel IDs; according to the connection request, establishing a connection with a corresponding to-be-connected master device, and performing data interaction with the to-be-connected master device in a target channel corresponding to the target channel ID of the Mode 0; and when the network master device is offline, determining a target master device in all the to-be-connected master devices, and enabling the target master device to serve as a new network master device to perform connection and data interaction with other to-be-connected master devices. According to the method, the network master device can be seamlessly switched, data interaction is carried out through a specific time sequence, and the transmission delay can be reduced.

System and method for reduced latency control of IoT devices. For example, one embodiment of a method comprises: associating a control device with one or more internet of things (IoT) devices, the control device including a wireless interface supporting broadcast messages over advertising channels and the one or more IoT devices including wireless interfaces supporting listening for the broadcast messages over the advertising channels; generating an advertising packet including an indication of an operation to be performed by the one or more IoT devices and generating a signature with a control device key; receiving the advertising packet at an IoT device of the one or more IoT devices; validating the signature using an IoT device key corresponding to the control device key; and performing the operation by the IoT device.

The application provides a wireless communication method, a battery power monitoring method, an electronic device and a storage medium. A wireless sensor network comprises a sink node and a plurality of sensor nodes. In an initial state, the radio frequency modules of the sink node and the sensor nodes are in a wireless receiving state. The wireless communication method comprises: receiving an upload monitoring data instruction; switching from the wireless receiving state to a wireless sending state; sending a first broadcast packet to the sink node, wherein the first broadcast packet comprises a wireless sensor network identification code, a sink node identification code, a sensor node identification code of the node, and an upload beacon identification code; the upload beacon identification code is used to prompt the sink node to send a first connection request packet to the sensor node; switching from the wireless sending state to the wireless receiving state; receiving the first connection request packet; establishing a wireless connection with the sink node and uploading monitoring data. The wireless communication method can avoid congestion caused by too many nodes.

An electronic system with automatic role judgement is provided. The electronic system includes a first device and a second device. The first device has the capability to act as a central device and a peripheral device role simultaneously, and is configured to activate an automatic pairing mode and continue to transmit a broadcast packet of the first device. The second device has the capability to act as the central device and the peripheral device role simultaneously, and is configured to activate the automatic pairing mode and continue to transmit a broadcast packet of the second device. The first device is configured to perform an automatic role judgement procedure to determine a central device from the first device and the second device according to the broadcast packets of the first device and the second device. The central device is configured to initiate and perform a pairing and connection operation.

The invention discloses a Bluetooth device matching connection method, a Bluetooth device, a storage medium and a product, and relates to the technical field of Bluetooth devices.The Bluetooth device matching connection method comprises the steps that a Bluetooth hardware communication module responds to a Bluetooth scanning instruction and sends a broadcast packet of a second Bluetooth device to an upper layer application module; the upper-layer application module generates an identification result according to the equipment category parameters in the broadcast packet, and sends a pairing instruction to the Bluetooth hardware communication module; the Bluetooth hardware communication module responds to the pairing instruction and starts a main service discovery process with the second Bluetooth device; when the identification result is that the preset function is supported, the upper-layer application module sends a connection instruction to the Bluetooth hardware communication module; the Bluetooth hardware communication module responds to the connection instruction to establish a sound control transmission channel with the second Bluetooth device after the main service discovery process is executed, and Bluetooth connection with the second Bluetooth device is completed. By adopting the method, the establishment time of the sound control transmission channel between the Bluetooth devices can be shortened.

A method can include, by operation of a wireless device, monitoring at least a first advertising channel for an advertising packet; in response to advertising data in the advertising packet, synchronizing transmission and reception of packets to an advertising link that includes sub-intervals within a repeating interval on a second advertising channel. During a download sub-interval of the sub-intervals, and update packet can be received that includes new parameter data. During an upload sub-interval of the sub-intervals, transmitting an update response packet indicating the new parameter data has been received. Wireless operations of the wireless device can be configured according to the new parameter data. Communications can continue with the same advertising link while operating according to the new parameter data. Corresponding devices and systems are also disclosed.