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Daniel kalu

•Created by Daniel kalu on 8/2/2024 in #firmware-and-baremetal

Resolving Intermittent Failures in ESP32-Based IoT Project with MQTT and I2C Sensors

Hey guys i am experiencing intermittent failures in my ESP32-based IoT project, which collects light sensor data from an ESP01 via MQTT. Despite implementing robust error handling and verifying I2C connections, I'm encountering: - Sporadic disconnections from the MQTT broker, resulting in missed sensor readings - Inconsistent timing in sensor data transmission, causing data gaps Error messages: - MQTT connection timeout: Timed out waiting for incoming data - I2C write error: SDA line stuck low Code snippet:

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  // Read sensor data
  int sensorValue = readSensorData();
  // Publish to MQTT topic
  client.publish("esp01/light", String(sensorValue).c_str());
  delay(1000); // 1-second interval
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("ESP32Client")) {
      client.subscribe("esp01/light");
    } else {
      delay(5000);
    }
  }
}

void loop() {
  if (!client.connected()) {
    reconnect();
  }
  client.loop();
  // Read sensor data
  int sensorValue = readSensorData();
  // Publish to MQTT topic
  client.publish("esp01/light", String(sensorValue).c_str());
  delay(1000); // 1-second interval
}

void reconnect() {
  while (!client.connected()) {
    if (client.connect("ESP32Client")) {
      client.subscribe("esp01/light");
    } else {
      delay(5000);
    }
  }
}

After reviewing task priorities, stack sizes, and mutexes, I suspect a subtle issue related to context switching between tasks or timing-sensitive operations. What advanced debugging techniques or optimization strategies can I employ to identify and resolve the root cause of these intermittent failures?

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