mapUser method
Returns node ID
Implementation
Future<String> mapUser(String uid, String secretKey) async {
final deviceSecretRequest = CmdSetUserMapping()
..userID = uid
..secretKey = secretKey;
final msgType = RMakerConfigMsgType.TypeCmdSetUserMapping;
final payload = RMakerConfigPayload()
..msg = msgType
..cmdSetUserMapping = deviceSecretRequest;
final data = await _device.sendDataToCustomEndPoint(
AppConstants.HANDLER_RM_USER_MAPPING, payload.writeToBuffer());
return _processDetails(data);
}