It seems my loop() function stops working after about 18-24 hours. Is there a way to call a cold reboot periodically?
I'm using a number of ESP8266 processors and they all exhibit the same problem. Maybe I should not write to serial if there's no serial device? Maybe I should try to catch web exceptions (is there such a thing) in the web code?
I'm from a Windows programming background so a lot of this is very new to me, but I'm having a great time making things!
Here's my code, it basically waits for a URL /trigger and then simply does a digitalWrite(pin,LOW) to ground signal on my garage door opener to open / close the garage door. I have another on my electric gate, same problem.
It also supports a diagnostics call (/diag) that dumps a few parameters and in the main loop I do a call to a web server to tell it the ESP is still online. This is what stops working after a day or so. The web calls to the ESP9266 still works though - /trigger and /diag still does it's thing, but the loop() loop stops.
I've removed the actual signal pin on the garage door / gate pcb - thinking there might be a spike that comes in and upsets the ESP, but the problem remains.
My code:
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <WiFiClient.h>
const char* ver="Bean1.4";
const String deviceName="Hek";
const int relay1Pin=12;
const int relay2Pin=13;
const int ledPin=5;
const int checkinPeriod = 1000*600; //10 minutes
const char* wifiSSID="Hein";
//const char* wifiSSID="Mia";
const char* wifiPass="abc0000000";
const IPAddress fixedIP(10, 6, 77, 30);
const IPAddress fixedSubnet(255,255,255,0);
const IPAddress fixedGateway(10,6,77,2);
const IPAddress fixedDNS(8,8,4,4);
const char* espServer = "10.6.77.3";
IPAddress myip,mySubnet,myGateway,myDNS;
long rssi;
String myMac = "";
unsigned long startTime = 0;
unsigned long lastCheckin = 0;
unsigned long lastTrigger = 0;
ESP8266WebServer server(80);
WiFiClient webClient;
void setup() {
// put your setup code here, to run once:
startTime = millis();
Serial.begin(115200);
delay(10);
Serial.println("");
Serial.print("Starting up ");
Serial.println(ver);
pinMode(relay1Pin,OUTPUT);
pinMode(relay2Pin,OUTPUT);
pinMode(ledPin,OUTPUT);
digitalWrite(relay1Pin,HIGH);
digitalWrite(relay2Pin,LOW);
digitalWrite(ledPin,HIGH); //I'm starting up
delay(1000);
digitalWrite(ledPin,LOW); //I'm starting up
Serial.println("setup complete");
//Connect to Wifi
Serial.println("");
Serial.print("Connecting to WiFi ");
Serial.print(wifiSSID);
// WiFi.config(myIP,dns,gateway,subnet);
WiFi.begin(wifiSSID,wifiPass);
while(WiFi.status()!=WL_CONNECTED) {
delay(500);
Serial.print(".");
myip=WiFi.localIP();
myGateway=WiFi.gatewayIP();
mySubnet=WiFi.subnetMask();
myMac=WiFi.macAddress();
}
Serial.println("");
Serial.println("Connected OK");
server.on("/diag", handleDiag);
server.on("/trigger", handleTrigger);
server.begin();
Serial.print("www server started: http://");
Serial.print(myip);
Serial.println("/");
Serial.print("Gateway / Subnet / MAC: ");
Serial.print(myGateway);
Serial.print(" / ");
Serial.print(myMac);
Serial.print(" / ");
Serial.println(mySubnet);
Serial.println("Connected to wifi");
checkIn();
}
void handleDiag() {
rssi=WiFi.RSSI();
String s = "OK.
Uptime: "+String((millis()-startTime) / 1000 / 60 / 60)+" hours
Last Trigger: "+String((millis()-lastTrigger)/1000)+" s ago"+
"
RSSI: "+String(rssi)+
"
Gateway: "+String(myGateway)+
"
Subnet: "+String(mySubnet);
server.send(200, "text/html", s);
}
void handleRoot() {
server.send(200, "text/html", "<h1>You are connected</h1>");
}
void handleTrigger() {
server.send(200, "text/html", "Trigger OK");
digitalWrite(relay1Pin,LOW);
digitalWrite(ledPin,LOW);
delay(500);
digitalWrite(ledPin,HIGH);
digitalWrite(relay1Pin,HIGH);
lastTrigger=millis();
}
void loop() {
unsigned long t;
server.handleClient();
//Flash LED if WiFi is down
if (WiFi.status()!=WL_CONNECTED) {
digitalWrite(ledPin,LOW);
delay(500);
digitalWrite(ledPin,HIGH);
delay(500);
}
else //otherwise check in every 10 seconds
{
digitalWrite(ledPin,HIGH);
if (checkinPeriod < (millis()-lastCheckin)) {
Serial.print("****Eval Reg: ");
Serial.print(checkinPeriod);
Serial.print(" > ");
Serial.println(millis()-lastCheckin);
checkIn();
}
}
ESP.reset();
}
//Call in to ESPresso server to update IP etc and confirm alive
void checkIn() {
lastCheckin = millis();
Serial.println("\nStarting registration...");
// if you get a connection, report back via serial:
if (webClient.connect(espServer, 80)) {
rssi=WiFi.RSSI();
Serial.println("connected to server");
// Make a HTTP request:
webClient.println("GET /ESPresso.dll/RegisterDevice?DeviceName="+deviceName+"&DeviceMac="+myMac+"&RSSI="+String(rssi)+"&app="+ver+" HTTP/1.1");
webClient.println("Host: "+String(espServer));
webClient.println("Connection: close");
webClient.println();
Serial.println("Sent stuff");
}
while(webClient.available()){
String line = webClient.readStringUntil('\r');
Serial.println(line);
}
}
Thanks for your patience with my green code! Any help would be hugely appreciated.
Result of too much fiddling with the code, I'm cleaning it up. If I can just figure out why loop() stops or how to restart it on a schedule...