Design And Implementation Of Bluetooth Mesh Network Remote Control Function

The Bluetooth Mesh network is a brand-new network topology based on Bluetooth Low Energy proposed by Bluetooth Special Interest Group.Bluetooth Mesh supports communication with low-power Bluetooth devices through GATT bearers,which simplifies the design process of Bluetooth Mesh remote control and is very suitable for application in the field of Internet of Things remote control.However,in a remote control system with a large amount of data and a complicated network,problems such as network congestion and message collision may occur,resulting in a high packet loss rate of the system.Therefore,it is necessary to design and implement a suitable Bluetooth Mesh remote control function to solve the high packet loss rate in the system and improve the reliability of remote control.In this thesis,based on the Bluetooth Mesh network,combined with MQTT technology,a highly reliable Bluetooth Mesh remote control function is realized.This thesis starts with reducing the overall packet loss rate of the system.In addition,a timeout retransmission mechanism and an adaptive message publishing mechanism are mentioned in the thesis as well.The timeout retransmission mechanism is to retransmit the control command that does not receive the Ack packet over the set time.The adaptive message issuance mechanism refers to setting different Qo S levels according to the service quality requirements of the control instructions,and judging whether the control instructions need to be published with delay according to the degree of network congestion.Aiming at the problem of delay increase caused by the above optimization,a priority queue mechanism setting a priority for each instruction and preferentially schedules the execution of high-priority instructions through the instruction scheduler is designed.Based on the above mechanism,the problems of high packet loss rate and delay in remote control are solved to a certain extent,and the reliability of the remote control system is improved.In this thesis,the remote control function for Bluetooth Mesh network is designed for actual measurement analysis.The test results show that the system can enable it to control the controlled nodes in the Bluetooth Mesh through the remote control terminal.After multiple retransmissions,the packet loss rate is less than 1%.In the case where the data packet sending rate is greater than 15 per second,the latency of high-priority instruction is reduced by more than 13% compared to the FIFO scheduling method,and the expected design index is reached.The research results of this thesis have certain engineering application value for Bluetooth Mesh remote control.