1. There are more than 40 standard and customized functions, going over this number will cause the network configuration to fail;
2. Whether the module is powered separately or the power supply power >=400ma;
3. IPEX module is unable to join the network, IPEX module needs to be connected to an antenna to use, IPEX module cannot use the on-board antenna;
4. Whether the module is authorized successfully, if it is only burned and not authorized, the module cannot join the network;