Polling not working for custom Device Type

I have created a custom Device Type and specified the capability “Polling”. Also wrote a poll() method. But the problem is that it is never called. When I manually refresh, it is working and the value is updating. I checked the log also and nothing is there, if I manually refresh the log is coming.

I saw couple of posting regarding this here but no concrete answer is given, could some help me to figure out the issue?

I moved 20 posts to an existing topic: Scheduler quits after some minutes, hours, or days

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