I want to implement a broadcast mechanism by Channel APIs. In server side, I use a model ClientID to store all connected client IDs, and send message by each client ID. For better performance, I need to know which client ID is "available" (the client is still connected or the token is still available). Is there any way to know below conditions in server side? 1, When does the token expire? 2. Is the client ID available or not? (Does the client still listen the channel or not?)
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