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agessaman
75d4656e59
Nothing has ever read it. The slot count comes from two other places: the persisted array size (MAX_MQTT_SLOTS / RUNTIME_MQTT_SLOTS in MQTTPresets.h) and the runtime cap MQTTBridge::getMaxActiveSlots(), which answers 5 with PSRAM and 2 without. A flag reading MAX_MQTT_BROKERS=3 sitting in every observer env implies a third, lower limit that does not exist — it cost me a wrong answer about how many MQTT slots a Heltec V4 exposes. 36 lines across 15 variants, all of them =3. Removing an unread -D cannot change code: heltec_v4_repeater_observer_mqtt builds to a byte-identical size before and after (1647744). The image checksum does differ, but so does it between two clean builds of untouched source — ESP-IDF stamps the app descriptor with the build time — so size is the meaningful comparison here. All 606 envs still parse; heltec_v4, heltec_v3, station_g2, rak3112 and xiao_s3_wio observer targets all build.