Handling BLE Connections
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Currently, the bt. object only supports the BLE peripheral role. This means that you cannot initiate a connection from the bt. object, but can only enable the bt. object to accept incoming connections from central devices. As soon as you bring up and enable the BLE interface, your device will be ready to accept incoming connections from central devices.
An on_bt_event(PL_BT_EVENT_CONNECTED) is generated every time your device accepts an incoming connection. An on_bt_event(PL_BT_EVENT_DISCONNECTED) is generated when the BLE connection is lost. In the following code example, the on_bt_event event handler sets various LED patters depending on the BLE state:
You can also check the status of the BLE connection at any time using the bt.connected R/O property.
As soon as the connection is established, you can send and receive data through the BLE interface.