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Camila_99$$

•Created by Camila_99$$ on 8/30/2024 in #edge-networking

How to Force HTTP Requests to Timeout on ESP32 When Router Freezes?

Hello! I've had a setup running for several months now, which makes HTTP requests to several devices on home WiFi network (the router is part of a Freebox). Everything works quite well, except for certain moments when I experience "freezes" of several seconds during a request. These freezes often disappear if I restart my Freebox (and thus the router). To avoid these freezes, I’m looking for a way to force the request to exit if it hasn’t succeeded within a second (for example). Here is the current code of one of my HTTP requests (launched every 5 seconds from the loop of my program):

void lect_ShellyEM()
{
  HTTPClient http;
  http.begin("http://192.168.1.12/emeter/0");   // Extracts data from the "emeter" 0 of the ShellyEM, i.e., the EDF consumption
  http.setConnectTimeout(500);                  // Local IP >> aborts directly after 0.5 s if no connection
  httpCode = http.GET();
    if (httpCode == HTTP_CODE_OK)               // Checks if the transmission was successful
    {
      StaticJsonDocument<256> doc;
      deserializeJson(doc, (http.getString())); // Extracts variables with ArduinoJson
      Pedf = doc["power"]; Pedft = doc["total"];
      if (top_m1 == true)                       // When the day changes
      {
        Pedf_m = Pedft;                         // Records the total from ShellyEM at midnight
        pref.begin("memo_infos", false);        // Writes the total in the "Pedf_m" section of the EEPROM
        pref.putFloat("Pedf_m", Pedf_m);        // in case of reset or power outage
        pref.end();
        top_m1 = false;                         // Resets top_m1
      }
    }
  http.end();
}

void lect_ShellyEM()
{
  HTTPClient http;
  http.begin("http://192.168.1.12/emeter/0");   // Extracts data from the "emeter" 0 of the ShellyEM, i.e., the EDF consumption
  http.setConnectTimeout(500);                  // Local IP >> aborts directly after 0.5 s if no connection
  httpCode = http.GET();
    if (httpCode == HTTP_CODE_OK)               // Checks if the transmission was successful
    {
      StaticJsonDocument<256> doc;
      deserializeJson(doc, (http.getString())); // Extracts variables with ArduinoJson
      Pedf = doc["power"]; Pedft = doc["total"];
      if (top_m1 == true)                       // When the day changes
      {
        Pedf_m = Pedft;                         // Records the total from ShellyEM at midnight
        pref.begin("memo_infos", false);        // Writes the total in the "Pedf_m" section of the EEPROM
        pref.putFloat("Pedf_m", Pedf_m);        // in case of reset or power outage
        pref.end();
        top_m1 = false;                         // Resets top_m1
      }
    }
  http.end();
}

I added the line http.setConnectTimeout(500);, but it doesn’t seem to be of much use... Maybe using a "watchdog" that would exit the request after some time? But I’m not really sure how to do that... So, I’m looking for all your expert advice! Thanks 🙏🏻

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