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Nick O'Leary's PubSubClient (MQTT 3.1.1), vendored so Arduino IDE and
PlatformIO both compile it from `src/`. Upstream:
https://github.com/knolleary/pubsubclient
Brought in by Simone Majocchi (@SimonePDA) along with the MQTT sidechannel
in `features/mqtt/core_mqtt.h`.
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