Research And Design Of Networking System Based On Low Energy Bluetooth MESH

With the rapid development of society,intelligent Internet of Things has been increasingly used in various fields.The most popular discussion on the Internet of Things is the carrier of data dissemination.The current common methods are Wifi and Zigbee,but Zigbee-enabled devices are few and require special configuration.Although Wifi is often used in daily life,it has a large transmission power defect.In view of the large load and high power consumption of traditional Mesh network nodes,this paper focuses on the low-power consumption as the main research direction,and designs a Mesh network system based on low-energy Bluetooth for small-scale IoT in the LAN area.the main research contents are:1.This paper design a new Mesh network architecture,its transmission mudium is low-energy Bluetooth and communication mode is "single connection,multi-broadcast".The architecture finally implement the function of multi-user and multi-time work together,and initially implement the model of small-scale IoT in the LAN area.2.This paper define the network establishment and network maintenance process,describe in detail the logical process of node access,node exit,work feedback,and data sharing,and customize the node status of the device,network communication messages,and network packets in different scenarios to meet the needs of all data interaction on the network.3.This paper design an improved routing strategy based on flood routing.Using the adjacent node set as the primary routing reference,this article determine the unique routing path to each node,reducing the number of times the redundant data packets are transmitted in the network,increasing the data transmission rate,and reducing the routing load.the device nodes in the network set up the timing according to the neighbor node set.The device periodically switches the working mode of the development board to reduce its operating power consumption.At the same time,the NS-2 network simulator is used to simulate and analyze the optimized route,which proves the effectiveness and feasibility of the routing strategy.4.This paper design and implement low-power device nodes,mobile phone control terminals and Mesh server respectively.The device node implements BLE data interaction,neighbor node acquisition,external device control,and work mode switching.The mobile phone control terminal implements functions such as discovering Bluetooth devices,establishing and maintaining networking,controlling device node operations,and simultaneously targeting the traditional low power consumption of the control terminal.The disadvantage of low reusability of Bluetooth connection objects,proposes a new reconnection specification,and tests the reconnection specification in the system test chapter.The server realizes the function of storing,backing up and sharing Mesh network information data,and storing multi-user information.The user and the multi-controller are involved in the relay of the Mesh network.5.This article perform a system test on the implemented network system.The module operation and Packet Sniffer software capture are used as the main testing methods.The results prove that the network system functions well and meets the overall design requirements.Compared with the conventional Mesh network,the network system designed in this paper reduces the power consumption of the device by 13.34% on average;the data transmission success rate is at least 98.46%,which is a reasonable range of wireless network transmission,and has been carried out for the proposed reconnection specification.The secondary reconnection test,on average,doubles the success rate compared to the conventional reconnection method,greatly increasing the multiplexing rate of the connected object.