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Troubleshooting

Troubleshooting tips

Connection is unstable (Device cycles between “online” and “offline” on SinricPro dashboard)

In ESP32 / ESP8266, adding a delay() (or long blocking code) directly affects Wi-Fi performance and stability, because of how the Wi-Fi stack works. So short delays (few ms) are usually safe. But long delays (> ~100ms) can cause Wi-Fi timeouts, missed packets, or disconnects.

If you have any long delay(x); in the loop() function, you may need to rewrite them to use them in a non-blocking manner.

Example (bad code):

const int ledPin = 2;

void setup() {   
    pinMode(ledPin, OUTPUT);
}

void loop() {
    delay(5000) //!!!!!!!!!!! DO NOT DO THIS!!!!!!!!!
    digitalWrite(ledPin, !digitalRead(ledPin));
}

Example (good code):

const int ledPin = 2;

// Variables to manage timing
unsigned long previousMillis = 0;  // Stores last time LED was updated
const long interval = 1000;        // Interval for blinking (milliseconds)

void setup() {
    // Initialize the LED pin as an output
    pinMode(ledPin, OUTPUT);
}

void loop() {
    // Get the current time
    unsigned long currentMillis = millis();

    // Check if the interval has passed
    if (currentMillis - previousMillis >= interval) {
        // Save the current time
        previousMillis = currentMillis;

        // Toggle the LED state
        digitalWrite(ledPin, !digitalRead(ledPin));
    }
}

Known Issue: WiFi Instability on ESP32/ESP8266 When Using ADC Pins

If you’re developing with ESP32 or ESP8266 and noticing erratic WiFi behavior — such as frequent disconnects, poor signal strength, or failed connections — you might be running into a well-documented hardware quirk: WiFi instability when analog-to-digital converter (ADC) pins are in use.

What’s Happening?

Both the ESP32 and ESP8266 use shared internal resources for WiFi radio and ADC operations. When the ADC is actively sampling (especially at high frequency or with continuous reads), it can interfere with the RF circuitry responsible for WiFi communication. This results in:

This issue is particularly noticeable when:

Workarounds & Best Practices

  1. Add Delays Between ADC Reads
    Avoid continuous polling. Introduce small delays (e.g., delay(10) or vTaskDelay()) between analog reads to give the WiFi stack breathing room.

    ```cpp int sensorValue = analogRead(A0); delay(10); // Let WiFi recover

Cannot connect to SinricPro

Logging

SinricPro SDK Logging
ESP8266/ESP32 Core Logging
* To enable ESP8266 logs, in Arduinio IDE:

    1. `Tools -> Debug Serial Port -> Serial`

    2. `Tools -> Debug Level -> SSL + HTTP_CLIENT`

* To enable ESP32 logs, in Arduinio IDE:

    1. `Tools -> Core Debug Level -> Verbose`

Memory Limitation