Hello.
I'm working with a device that uses a ESP32-WROVER-E, which is a LilyGo T-SIM7600G-H.
I have been trying to write a very simple code that connects the ESP32 to a WiFi network, perform an action and after the action is performed, I disconnect the ESP32 from the network and shutdown the ESP32 wireless feature so that I can save battery.
The code I have is split in 2 files: project.ino and wifi_handler.cpp.
The part of the code from project.ino that manages the WiFi connection is this:
// WiFi connection check and retry logic
if (millis() - last_wifi_attempt >= WIFI_RETRY_INTERVAL) {
if (!wifi_connected) {
// No WiFi connection, try to connect
SerialMon.println("Attempting to connect to WiFi...");
int wifi_status = connect_wifi(wifi_ssid, wifi_passwd);
if (wifi_status == 1) {
GOT_HERE();
wifi_connected = true;
SerialMon.println("Connected to WiFi!");
} else if (wifi_status == 0) {
SerialMon.println("Failed to connect to WiFi.");
GOT_HERE();
} else if (wifi_status == -1) {
SerialMon.println("Connection in progress...");
GOT_HERE();
}
}
// If WiFi is connected, proceed with data submission
if (wifi_connected) {
String address = get_address_from_coordinates(loc.lat, loc.lon);
snprintf(description, BUFFER, address.c_str());
send_to_database(sensorID,
loc.lat, loc.lon,
distance,
weight,
description);
int disconnect_status = disconnect_wifi();
if (disconnect_status == 0){
SerialMon.println("WiFi Disconnected.");
} else if (disconnect_status == 1){
SerialMon.println("WiFi not connected.");
} else {
SerialMon.println("Failed to disconnect from WiFi");
}
last_wifi_attempt = millis(); // Update last_wifi_attempt to prevent immediate retry
}
}
The code I have for connect_wifi() and disconnect_wifi() is the following:
connect_wifi()
int connect_wifi(const char* ssid, const char* pwd){
wl_status_t wifi_status = WiFi.status();
if (WiFi.status() == WL_CONNECTED){
return 1; // Already connected
}
if (wifi_status == WL_DISCONNECTED ||
wifi_status == WL_NO_SHIELD ||
wifi_status == WL_IDLE_STATUS ||
wifi_status == WL_CONNECT_FAILED){
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, pwd);
unsigned long connect_start = millis();
while(WiFi.status() != WL_CONNECTED &&
(millis() - connect_start < 5000)){
delay(500);
SerialMon.print(".");
}
if (WiFi.status() == WL_CONNECTED){
return 1; // Connection successfull
} else {
return 0; // Connection to WiFi failed
}
} else {
return 1; // Connection in progress
}
return -1;
}
and disconnect_wifi():
int disconnect_wifi(){
/*
* 0 -> WiFi disconnected successfully
* 1 - WiFi is not connected
* 2 - Failed to disconenct (timeout)
*/
if (WiFi.status() != WL_CONNECTED){
return 1; // No action needed. We are not connected,
// so no disconnect needed
}
WiFi.disconnect(true);
unsigned long start_time = millis();
while(WiFi.status() == WL_CONNECTED && millis() - start_time < 1000){
delay(100);
}
if (WiFi.status() != WL_CONNECTED){
WiFi.mode(WIFI_OFF);
delay(100);
return 0; // WiFi disconencted and hardware is OFF to save battery
} else {
return 2; // WiFi, for some reason, didn't disconnect
}
}
What happens is that when the diconnect_function() is called, I always get the E (80514) wifi:NAN WiFi stop, which leads later to more issues like, for some reason, the connect_wifi() functions seems not to be called again as if the WiFi is still connected.
Is there anything obvious in the code that might be triggering this behaviour?
