/**
* \fn changeStateMqttFlow
* \brief change the state of the mqtt workflow
* \param [in] state : target input state
*/
private void changeStateMqttFlow(bool state)
{
if (true == state)
{
this.listConsole.Items.Clear();
//
this.m_currentSubscribeInformation = new MqttSubscribeInfo(new string[] { MQTT_MAIN_TOPIC }, new byte[] { 0x00 });
int port = 0;
if (true == int.TryParse(this.tbBrokerPortInput.Text, out port))
{
this.m_currentBrokerInfos = new MqttBrokerInfo(this.tbBrokerHostnameInput.Text, port);
//
this.m_client = new SampleMqttClient(this.m_currentBrokerInfos, false, null, null, uPLibrary.Networking.M2Mqtt.MqttSslProtocols.None);
this.m_client.Connect();
this.m_client.Subscribe(this.m_currentSubscribeInformation, SampleMqttClient_MqttMsgPublishReceived);
//
this.btnManageWorkflow.Content = DISPLAY_STOP_WF;
this.listConsole.Items.Add($"=========> : {DISPLAY_START_WF}");
}
}
else
{
this.m_client.Unsubscribe(this.m_currentSubscribeInformation, SampleMqttClient_MqttMsgPublishReceived);
this.m_client.Disconnect();
this.m_client = null;
//
this.m_currentSubscribeInformation = null;
this.m_currentBrokerInfos = null;
//
this.btnManageWorkflow.Content = DISPLAY_START_WF;
this.listConsole.Items.Add($"=========> : {DISPLAY_STOP_WF}");
}
this.m_bWorkflowStarted = state;
}
/**
* \fn Unsubscribe
* \brief unsubscribe from mqtt flow
* \param [in] mqttSubscribeInfo : mqtt subscribe informations
* \param [in] us_topics : target topics for unsubscription
* \return success or failed
*/
public bool Unsubscribe(MqttSubscribeInfo mqttSubscribeInfo, MqttMsgPublishEventHandler callBack)
{
try
{
//unsubscribe
if (null != callBack)
{
MqttMsgPublishReceived -= callBack;
}
Unsubscribe(mqttSubscribeInfo.Topics);
return(true);
}
catch (Exception ex)
{
throw new Exception($"Exception while trying to unsubscribe from broker (host={BrokerInfo.broker_address}, port={BrokerInfo.broker_port}) : {ex.Message}", ex);
}
}
/**
* \fn Subscribe
* \brief subscribe to mqtt flow
* \param [in] subscribeInfo : mqtt subscribe informations
* \param [in] callBack : callback for event association
* \return success or failed
*/
public bool Subscribe(MqttSubscribeInfo subscribeInfo, MqttMsgPublishEventHandler callBack)
{
try
{
// register to message received
if (null != callBack)
{
MqttMsgPublishReceived += callBack;
}
// subscribe to the topic
Subscribe(subscribeInfo.Topics, subscribeInfo.QoS);
return(true);
}
catch (Exception ex)
{
throw new Exception($"[ElaMqttSubscriber]\t[Subscribe]\tException while subscribing to broker (host={BrokerInfo.broker_address}, port={BrokerInfo.broker_port}): {ex.Message}", ex);
}
}
