• smarthome.
• DataFlow.
• TcpRequestData

const payload = new Uint8Array([0x00, 0xFF, 0x00, 0xFF]);

const command = new DataFlow.TcpRequestData();
command.requestId = request.requestId;
command.deviceId = 'device-id';
command.port = 5555;
command.operation = Constants.TcpOperation.WRITE;
command.data = Buffer.from(payload).toString('hex');

const command = new DataFlow.TcpRequestData();
command.operation = Constants.TcpOperation.READ;
...

localHomeApp.getDeviceManager()
 .send(command)
 .then((result: DataFlow.CommandSuccess) => {
   const tcpResult = result as DataFlow.TcpResponseData;
   const response = tcpResult.tcpResponse.data;
 })
 .catch((err: IntentFlow.HandlerError) => {
   // Handle command error
 });