DXYBT624-G00 Bluetooth module is a Bluetooth module developed by DXY core (hereinafter referred to as DXY or Ding Core) based on a Bluetooth SOC chip. Support Bluetooth 5.0 BLE protocol stack, support up to 3 master 4 slave, a total of 7 devices connected at the same time, a single packet can send a maximum of 244 bytes of user net load. In addition, the module has rich peripheral functions, such as UART, SPI, IIC, etc., which can meet various iot application scenarios. AT present, the special firmware of electric meter developed by DXY supports AT command and DL698 protocol control at the same time, and supports up to 3 master and 4 slave connections at the same time. The roles of collector, electric meter and load switch can be switched through AT command, and the firmware is unified.