setReconnect method Null safety

Implementation

setReconnect() {
  signaling?.on('migrate', this, (ev, context) async {
    signaling?.isMigrating = true;
    await replaceConnection();
    signaling?.isMigrating = false;
  });
  if (autoReconnect) {
    signaling?.on(SignalingEvents.connectionError, this, (event, context) {
      if ((firstReconnection == null || alreadyDisconnected == false)) {
        firstReconnection = false;
        reconnect();
      }
    });

    webRTCPeer.on(webRTCEvents['connectionStateChange'], this,
        (event, context) {
      var state = event.eventData;
      if ((state == 'failed' ||
              (state == 'disconnected' && alreadyDisconnected!)) &&
          firstReconnection!) {
        firstReconnection = false;
        reconnect();
      } else if (state == 'disconnected') {
        alreadyDisconnected = true;
        Timer(const Duration(milliseconds: 1500), () => reconnect());
      } else {
        alreadyDisconnected = false;
      }
    });
  }
}