serious bug: connection to phones not being properly tracked

src/nimble/NimbleBluetoothAPI.cpp

@@ -31,6 +31,10 @@ void BluetoothPhoneAPI::onNowHasData(uint32_t fromRadioNum)
     }
 }
 
+bool BluetoothPhoneAPI::checkIsConnected() {
+    return curConnectionHandle != -1;
+}
+
 int toradio_callback(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg)
 {
     auto om = ctxt->om;

src/nimble/NimbleBluetoothAPI.h

@@ -6,10 +6,14 @@ extern uint16_t fromNumValHandle;
 
 class BluetoothPhoneAPI : public PhoneAPI
 {
+protected: 
     /**
      * Subclasses can use this as a hook to provide custom notifications for their transport (i.e. bluetooth notifies)
      */
     virtual void onNowHasData(uint32_t fromRadioNum);
+
+    /// Check the current underlying physical link to see if the client is currently connected
+    virtual bool checkIsConnected();
 };
 
 extern PhoneAPI *bluetoothPhoneAPI;