Count number of sensors reporting data

[Steve-Mcl]

@alpha815

our sensors have unique id

Here is a solution for a similar requirement. It should work for you...

Counting messages per main topic

First you would need to split the topic and grab the first part. Then you could use a function node and an object stored in context to count them... example... [chrome_ay2VTcASfH] demo flow... [{"id":"8f7f9a59772e9c54","type":"inject","z":"a4633311d1bf470d","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"main1/sub1","payload":"","payloadType":"date","x":1940,"y":800,"wires":[["4b61f945350d10d6"]]},{"id":"4b61f945350…

... Just change topic to the path of your id