Users Manual

HM-BT2204 V1.0
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4 Module Function Description
After the module is started, it will automatically broadcast. The mobile
device that has opened a specific APP will scan and connect with the
module. After successful connection, the module can be operated through
the BLE protocol. The external MCU can carry out wireless
communication with the mobile device through the serial port of the
module, and the external MCU can also send the control commands to
change the communication parameters through the serial port of module.
The user’s data format is defined by the upper application. The mobile
device can send data to the module through the APP, and then the data
will be send to the external MCU through the serial port of module. After
the module receives the data packet from the external MCU, it will
automatically forward it to the connected mobile device. The user needs
to complete the code design of the external MCU and APP running on the
mobile device.