added isConnectionOpen to the interface and analysis this during execution

Signed-off-by: Jürgen Eckel <juergen@riddleandcode.com>

monitor/mqtt_monitor.go

@@ -221,7 +221,7 @@ func (mms *MqttMonitor) MonitorActiveParticipants() {
 		log.Println("[app] [Monitor] subscribed to tele/# channels")
 
 		for !mms.IsTerminated() {
-			if !mqttClient.IsConnected() {
+			if !mqttClient.IsConnected() || !mqttClient.IsConnectionOpen() {
 				log.Println("[app] [Monitor] retry establishing a connection")
 				break // Exit inner loop on disconnect
 			}

util/mocks/mqtt.go

@@ -9,14 +9,15 @@ import (
 
 // MockMQTTClient is the mock mqtt client
 type MockMQTTClient struct {
-	ConnectFunc     func() mqtt.Token
-	DisconnectFunc  func(quiesce uint)
-	PublishFunc     func(topic string, qos byte, retained bool, payload interface{}) mqtt.Token
-	SubscribeFunc   func(topic string, qos byte, callback mqtt.MessageHandler) mqtt.Token
-	UnsubscribeFunc func(topics ...string) mqtt.Token
-	IsConnectedFunc func() bool
-	connected       bool
-	connectedMutex  sync.Mutex
+	ConnectFunc          func() mqtt.Token
+	DisconnectFunc       func(quiesce uint)
+	PublishFunc          func(topic string, qos byte, retained bool, payload interface{}) mqtt.Token
+	SubscribeFunc        func(topic string, qos byte, callback mqtt.MessageHandler) mqtt.Token
+	UnsubscribeFunc      func(topics ...string) mqtt.Token
+	IsConnectedFunc      func() bool
+	IsConnectionOpenFunc func() bool
+	connected            bool
+	connectedMutex       sync.Mutex
 }
 
 // GetConnectFunc fetches the mock client's `Connect` func
@@ -129,3 +130,10 @@ func (m *MockMQTTClient) IsConnected() bool {
 	m.connectedMutex.Unlock()
 	return connected
 }
+
+func (m *MockMQTTClient) IsConnectionOpen() bool {
+	m.connectedMutex.Lock()
+	connected := m.connected
+	m.connectedMutex.Unlock()
+	return connected
+}

util/mqtt.go

@@ -23,6 +23,7 @@ type MQTTClientI interface {
 	Subscribe(topic string, qos byte, callback mqtt.MessageHandler) mqtt.Token
 	Unsubscribe(topics ...string) mqtt.Token
 	IsConnected() bool
+	IsConnectionOpen() bool
 }
 
 var (