GATT Server-Client (FSC-BT671）
l One of the standard firmwares of the module simultaneously supports GATT server and GATT client features, when the user use the AT commands for the GATT client feature, the module will act as client (master) role, otherwise, it acts as Server (slave) role.
l The list of AT commands for the GATT client feature:
Scan nearby devices
Establish GATT connection
Release all Bluetooth connections
Only available in AT-command mode
Send data via GATT
Note: for more information about these commands, please refer to FSC-BT6XX Programming User Guide V3.0(BLE)
l Typical AT-Command Mode GATT Client Interaction:
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