add status message on mqtt

opcua2mqtt/MqttPublish.py

@@ -2,6 +2,7 @@ from threading import Event
 from loguru import logger
 from MqttBase import AbstractMqttPublisher
 from queue import Empty
+import json
 
 
 LOOP_SLICE = 0.1  # seconds
@@ -11,8 +12,11 @@ class MqttPublish(AbstractMqttPublisher):
         super().__init__(config)
         self.queue = queue
         self.topicPre = self.config["publishTopicPrefix"]
+        self.statusTopic = self.config["statusTopic"]
+        self.statusThreshold = self.config["statusThreshold"]
 
     def localLoop(self):
+        cnt = 0
         while not self.killBill:
             try:
                 dataObject = self.queue.get(timeout=LOOP_SLICE)
@@ -22,7 +26,11 @@ class MqttPublish(AbstractMqttPublisher):
                     topic = self.topicPre + '/' + dataObject.getTopicPost()
                     payload = dataObject.getPayload()
                     self.client.publish(topic, payload)
+                    cnt += 1
                     logger.debug("mqtt message sent: {} -> {}".format(topic, payload))
+                    if cnt % 100 == 0:
+                        payload = { "count": cnt }
+                        self.client.publish(self.statusTopic, json.dumps(payload), retain=True)
             except Empty:
                 if self.killBill:
                     logger.error("killbill received")

opcua2mqtt/config.json

@@ -2,7 +2,9 @@
     "mqtt": {
         "broker": "172.16.2.16",
         "port": 1883,
-        "publishTopicPrefix": "opcua"
+        "publishTopicPrefix": "opcua",
+        "statusTopic": "opcua/bridge/status",
+        "statusThreshold": 100
     },
     "opcua": [
         {