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Enhance MQTT debug macros to prevent hangs by checking Serial availability before printing.

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agessaman committed 2026-01-02 13:36:41 -08:00
1 parent 03d519f8d4
commit 3589043b2e
1 file changed
+5 -2
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src/helpers/bridges/MQTTBridge.h
+5 -2
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@@ -11,8 +11,11 @@
#if defined(MQTT_DEBUG) && defined(ARDUINO)
#include <Arduino.h>
#define MQTT_DEBUG_PRINT(F, ...) Serial.printf("MQTT: " F, ##__VA_ARGS__)
#define MQTT_DEBUG_PRINTLN(F, ...) Serial.printf("MQTT: " F "\n", ##__VA_ARGS__)
// USB CDC-aware debug macros: only print if Serial is ready (non-blocking check)
// Serial.availableForWrite() returns bytes available in write buffer (>0 means ready)
// This prevents hangs when USB CDC isn't ready yet (e.g., ESP32-S3 native USB)
#define MQTT_DEBUG_PRINT(F, ...) do { if (Serial.availableForWrite() > 0) { Serial.printf("MQTT: " F, ##__VA_ARGS__); } } while(0)
#define MQTT_DEBUG_PRINTLN(F, ...) do { if (Serial.availableForWrite() > 0) { Serial.printf("MQTT: " F "\n", ##__VA_ARGS__); } } while(0)
#else
#define MQTT_DEBUG_PRINT(...) {}
#define MQTT_DEBUG_PRINTLN(...) {}