DevHeads IoT Integration ServerDIIS
DevHeads IoT Integration Server•2y ago
Daniel kalu

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);
    }
  }
}

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?
Solution
check this out https://www.electronicwings.com/esp32/reconnect-esp32-to-wi-fi-network-after-lost-connection
Reconnect ESP32 to Wi-Fi Network After Lost Connection | ESP32
In this guide, we will see how to reconnect to the wifi network after being lost on ESP32 Board.
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