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Some controllers do not have the ability (or have a limited ability) to restore state after restarting.
This optional feature flag will allow the MQTT gateway client to publish very specific messages (C_SET, and C_INTERNAL w/type I_BATTERY_LEVEL) with the retain flag set.
The current behavior should not be impacted.
--
I've been using the
bool retain = ...
code for nearly a year now; it has worked quite well for me. I thought I'd put it behind a feature flag and see if it'd be useful to other people.