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;