ESP32 Mongoose OS Interface WiFi

This code is written for ESP32 running Mongoose OS (MOS).
It monitors the Wi-Fi network connection status and prints updates to the serial console whenever the ESP32’s connection state changes. Also Refer: https://github.com/aruneworld/ESP8266/blob/master/Mongoose-OS/Examples/AEW_TCP_Web_Server.js, Let explain about ESP32 Mongoose OS Interface WiFi

WiFi Status Monitor

// Monitor network connectivity.
Net.setStatusEventHandler(function(ev, arg) {
  let evs = "???";
  if (ev === Net.STATUS_DISCONNECTED) {
    evs = "DISCONNECTED";
  } else if (ev === Net.STATUS_CONNECTING) {
    evs = "CONNECTING";
  } else if (ev === Net.STATUS_CONNECTED) {
    evs = "CONNECTED";
  } else if (ev === Net.STATUS_GOT_IP) {
    evs = "GOT_IP";
  }
  print("== Net event:", ev, evs);
}, null);

Code Explanation

// Register a network status event handler
Net.setStatusEventHandler(function(ev, arg) {
  let evs = "???";

• Net.setStatusEventHandler → Registers a callback function that will be called whenever the network status changes.
• ev → Event code (numeric constant representing network state).
• arg → Optional event argument (not used here).
• evs → Human-readable string initialized to "???".

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  if (ev === Net.STATUS_DISCONNECTED) {
    evs = "DISCONNECTED";
  } else if (ev === Net.STATUS_CONNECTING) {
    evs = "CONNECTING";
  } else if (ev === Net.STATUS_CONNECTED) {
    evs = "CONNECTED";
  } else if (ev === Net.STATUS_GOT_IP) {
    evs = "GOT_IP";
  }

• Here the code maps network status codes to readable strings:
  • DISCONNECTED → No WiFi or lost connection.
  • CONNECTING → ESP32 is trying to connect to WiFi.
  • CONNECTED → Connected to AP, but no IP yet.
  • GOT_IP → Successfully connected and got an IP address from DHCP.

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  print("== Net event:", ev, evs);
}, null);

• Prints the event number (ev) and its readable string (evs) to the serial console.
• The null at the end means no extra user-data is passed to the handler.

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Example Output on Serial Monitor

When you boot the ESP32 with WiFi enabled, you might see logs like:

== Net event: 0 DISCONNECTED
== Net event: 1 CONNECTING
== Net event: 2 CONNECTED
== Net event: 3 GOT_IP

This lets you debug WiFi connectivity in real-time.

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In short:

This code is a WiFi connection monitor for ESP32 with Mongoose OS. It listens for WiFi events and prints whether the ESP32 is disconnected, connecting, connected (without IP), or fully connected (with IP).