The QoS of retained messages should depend on subscribers #288
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broker not store zero-byte retained messages
[MQTT-3.3.1-5] If the RETAIN flag is set to 1, in a PUBLISH Packet sent by a Client to a Server, the Server MUST store the Application Message and its QoS, so that it can be delivered to future subscribers whose subscriptions match its topic name We store the retained message QoS in a persistence store. If the retain message is QoS 1 Sub (QoS 2) will get the msg in QoS 1 Sub (QoS 1) will get the msg in QoS 1 Sub (QoS 0) will get the msg in QoS 0 (downgraded)
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From MQTT 3.1.1 spec
We store the retained message QoS in a persistence store. If the retain message is QoS 1
Subscriber (QoS 2) will get the retained msg in QoS 1
Subscriber (QoS 1) will get the retained msg in QoS 1
Subscriber (QoS 0) will get the retained msg in QoS 0 (downgraded)