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eclipse-paho / paho.mqtt.golang

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Shared Subscription doesn't work as expected #556

Closed fherryfherry closed 2 years ago

fherryfherry commented 2 years ago

Hi anyone, is this library support shared subscription? because I tried but there is no message received Topic Example: $shared/group/blabla

MattBrittan commented 2 years ago

Shared subscriptions are an MQTT v5 feature; some v3 (which this library supports) brokers do offer support but this is outside the v3 spec. This issue may help; from this it is my understanding that the library supports shared subscriptions (but it's not something I use or have tested). If you want help you will need to provide more information (what broker are you using, what topic are you publishing on, do other clients such as mosquitto_sub receive the message etc).

fherryfherry commented 2 years ago

Shared subscriptions are an MQTT v5 feature; some v3 (which this library supports) brokers do offer support but this is outside the v3 spec. This issue may help; from this it is my understanding that the library supports shared subscriptions (but it's not something I use or have tested). If you want help you will need to provide more information (what broker are you using, what topic are you publishing on, do other clients such as mosquitto_sub receive the message etc).

Thanks for your fast response. Is there any go lang library for mosquitto_sub?

MattBrittan commented 2 years ago

mosquitto_sub is a command line tool that comes with Mosquito (MQTT explorer or similar would be fine too). I was just asking if you have tested this with another program (rather than assuming it's an issue with this library and not the broker/publisher).