Allow a few methods to be overridden by subclasses #16
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Background in meshtastic/firmware#5724. I'd like to contribute some unit tests to the Meshtastic project. Right now I'm mocking at the level of the
Client
and needing to implement a small MQTT server inside the unit tests. That isn't ideal as the unit tests are somewhat tied to the implementation details of PubSubClient. Having virtual methods would allow for mocking these methods directly and reduce the code required for writing unit tests for clients of PubSubClient.