? What are the advantages and characteristics of ZigBee technology wireless communication?

IoT application of zigbee Mesh networking First of all, the ZigBee module is based on the IEEE802.15.4 protocol technical standard. It has its own unique characteristics with the IEEE802.11 standard protocol of the WIFI module and the IEEE802.15.1 protocol standard of the Bluetooth module. The relationship between them is only complementary and cannot be replaced by each other. . In the above IEEE technical standards, the physical characteristics of IEEE802.15.4 and IEEE802.11 are similar, and the CSMA/CA communication method based on CCA Single serial port server carrier sense is adopted, which is very suitable for many-to-many communication of devices. Mesh network has extremely high communication efficiency. However, IEEE802.15.1 adopts the HFSS frequency hopping principle, and it is not easy to achieve similar channel detection functions. It can only work according to the time slot of the master-slave model. In the BLE Mesh application, it communicates by broadcasting, and in the BLE Mesh application It will try to avoid the situation where multiple devices communicate with the same device at the same time. Therefore, in the application of Mesh network, the compatibility and reliability of ZigBee is far better than that of BLE Mesh. The disadvantage of ZigBee wireless technology is that the control terminal cannot be integrated on the smart phone and needs to be controlled through a gateway. Of course, there is also a ZigBee Dongle or ZigBee remote control as the control terminal, but it must also be authorized by the gateway. Unlike the BLE Mesh ad hoc network, which is a "public toilet" type of access that "comes and leaves when you want to", in short, it is BLE Mesh. Access is more convenient but ZigBee access is more secure. Zigbee networking mode Interoperability of zigbee technology The ZigBee protocol has developed a set of equipment control standards since its birth, called ZCL (ZigBee Cluster Library). In the early version of the ZigBee protocol, ZCL was very imperfect and was abandoned by smart home manufacturers and other application solution providers that started earlier. As a result, the products of different equipment manufacturers are incompatible with each other, and even these products are deliberately designed to be incompatible with each other from the beginning. However, with the introduction of the ZigBee 3.0 protocol, ZCL is a mandatory option, and chip manufacturers are also forcing the use of ZCL in chips, resulting in equipment manufacturers needing to spend additional research and development costs to make their products incompatible with other manufacturers, which leads to many equipment manufacturers. For the sake of convenience, they are forced to make their own products interconnected with other people's products. In addition, ZCL also derived a concept called "object model", which has been borrowed by many intelligent cloud service providers, and based on this, it has also derived a concept that can be used for IPv6 (including Google Thread, which is also based on IEEE802.15.4). Matter Protocol. The object model turns the dull and cold string of data in the communication protocol Remote IO module into a more visual device entity, such as how many switches and several lights are mounted on this device, which sensors are mounted? How much temperature, how much brightness, is there an alarm? For device-side developers, when adding a certain function or increasing the number of certain functions to the device, they do not need to consider the compatibility of the communication protocol. copy and paste. Compared with other mainstream IoT wireless transmission protocols, currently only BLE Mesh has launched a SIG Mesh standard, but this standard is mandatory in BLE chips, and many manufacturers can choose not to support it, resulting in BLE Mesh devices with data access. But there is a "chicken and duck talk" between equipment and equipment. Fortunately, smartphones support BLE Mesh access, allowing smartphones to act as controllers, one manufacturer and one APP, which also speeds up the scrapping and elimination of smartphones.