Implement missing MQTTv3 protocol support #1190
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According to docs MQTTv3 should be supported, but the Go SDK lacks v3 support.
Probably thats's because paho has 2 confusingly named libraries:
github.com/eclipse/paho.golang
- used currently by the SDK, it only supports MQTT v5github.com/eclipse/paho.mqtt.golang
- older client that supports MQTT v3This PR implements proto that would support v3 servers, tested with mochi broker.
Any feedback welccome!