feat: Add external-mqtt-trigger configuration file for TAF test (#338)

Signed-off-by: Cherry Wang <cherry@iotechsys.com>

res/external-mqtt-trigger/configuration.toml

@@ -0,0 +1,108 @@
+[Writable]
+LogLevel = "INFO"
+
+  [Writable.StoreAndForward]
+  Enabled = false
+  RetryInterval = "5m"
+  MaxRetryCount = 10
+
+  [Writable.Pipeline]
+  ExecutionOrder = "MQTTExport"
+  UseTargetTypeOfByteArray = true
+
+  [Writable.Pipeline.Functions]
+    [Writable.Pipeline.Functions.MQTTExport]
+      [Writable.Pipeline.Functions.MQTTExport.Parameters]
+      BrokerAddress = "tcp://localhost:1883" # Hive Public Test Broker
+      # Topic can have place holders in the form "{key-name}" that are replaced with matching Context values. Error occurs if no value match place holder(s).
+      Topic = "edgex-export"
+      SecretPath = "mqtt"
+      ClientId = "external-mqtt-export"
+      QOS="0"
+      AutoReconnect="false"
+      KeepAlive = "" # Empty indicates to use default value
+      ConnectTimeout = "" # Empty indicates to use default value
+      Retain="false"
+      SkipVerify = "false"
+      AuthMode = "none"
+      PersistOnError = "false"
+
+# InsecureSecrets are required for Store and Forward DB access and for authenticated MQTT exports with
+# new MQTTSecretSend function when not using security services, i.e. Vault
+  [Writable.InsecureSecrets]
+    [Writable.InsecureSecrets.DB]
+    path = "redisdb"
+      [Writable.InsecureSecrets.DB.Secrets]
+      username = ""
+      password = ""
+    [Writable.InsecureSecrets.mqtt]
+    path = "mqtt"
+      [Writable.InsecureSecrets.mqtt.Secrets]
+      username = ""
+      password = ""
+      cacert = ""
+      clientcert = ""
+      clientkey = ""
+
+[Service]
+HealthCheckInterval = "10s"
+Host = "localhost"
+Port = 59706
+ServerBindAddr = "" # if blank, uses default Go behavior https://golang.org/pkg/net/#Listen
+StartupMsg = "app-external-mqtt-trigger has Started"
+MaxResultCount = 0 # Not curently used by App Services.
+MaxRequestSize = 0 # Not curently used by App Services.
+RequestTimeout = "5s"
+
+[Registry]
+Host = "localhost"
+Port = 8500
+Type = "consul"
+
+# Database is require when Store and Forward is enabled or when using Redis for the Messagebus
+# Note when running in docker from compose file set the following environment variables:
+# - Database_Host: edgex-redis
+[Database]
+Type = "redisdb"
+Host = "localhost"
+Port = 6379
+Timeout = "30s"
+
+# SecretStore is required when Store and Forward is enabled and running with security
+# so Database credentials can be pulled from Vault. Also now require when running with secure Consul
+# Note when running in docker from compose file set the following environment variables:
+#   - SecretStore_Host: edgex-vault
+[SecretStore]
+Type = "vault"
+Host = "localhost"
+Port = 8200
+Path = "app-external-mqtt-trigger/"
+Protocol = "http"
+RootCaCertPath = ""
+ServerName = ""
+TokenFile = "/tmp/edgex/secrets/app-external-mqtt-trigger/secrets-token.json"
+  [SecretStore.Authentication]
+  AuthType = "X-Vault-Token"
+
+[Clients]
+  # Used for version check on start-up
+  [Clients.core-metadata]
+  Protocol = "http"
+  Host = "localhost"
+  Port = 59881
+
+[Trigger]
+Type="external-mqtt"
+  [Trigger.ExternalMqtt]
+    Url = "tcp://localhost:1883" #  fully qualified URL to connect to the MQTT broker
+    SubscribeTopics="external-request/#"
+    PublishTopic="" # optional if publishing response back to the the External MQTT Broker
+    ClientId = "external-mqtt-trigger" 
+    ConnectTimeout = "5s" # 5 seconds
+    AutoReconnect = true
+    KeepAlive = 10 # Seconds (must be 2 or greater)
+    QoS = 0 # Quality of Service 0 (At most once), 1 (At least once) or 2 (Exactly once)
+    Retain = true
+    SkipCertVerify = false
+    SecretPath = "mqtt-trigger" 
+    AuthMode = "none"