Change LED to PWM, Change timer to run in interval, Optimize HTTP headers, Correctly sync time, Fix invalid hostname, Fix version URL displays incorrect version

src/html.cpp

@@ -195,9 +195,8 @@ void handleToggle() {
 	}
 	debug(F("Status: "));
 	debugln(stat[i]);
-	reload_home();
 	server.sendHeader(F("Location"), F("/"), true);
-	server.send(302, F("text/html"), home_html);
+	server.send(302);
 	debugln(override[i]);
 	debugln(F("---------------------------"));
 }

src/main.cpp

@@ -27,6 +27,7 @@ DallasTemperature sensors(&oneWire);
 
 int temperature, temperatureSet, minTemperatureSet;
 static unsigned long lastTempCycle = -5000;
+static unsigned long lastTimeCycle = -5000;
 
 char time_all[8][8][3] = {
 	{}, {}, {}, {},
@@ -203,6 +204,7 @@ void handleRestart() {
 }
 
 void handleTime() {
+	bool changed = false;
 	if (server.arg("rule") != "") {
 		debugln("write main");
 		const char args[4][9] = {"time_o", "time_f", "time_o_1", "time_f_1"};
@@ -225,6 +227,7 @@ void handleTime() {
 					server.arg("rule").toInt() * 4 + arg * 64 + 32,
 					atoi(time_all[arg * 2 + 1][server.arg("rule").toInt()]));
 				EEPROM.commit();
+				changed = true;
 			}
 		}
 	}
@@ -233,20 +236,28 @@ void handleTime() {
 		temperatureSet = server.arg("temperature").toInt();
 		EEPROM.put(256, temperatureSet);
 		EEPROM.commit();
+		changed = true;
 	}
 	if (server.arg("min_temperature").toInt() != minTemperatureSet) {
 		debugln("write minTemperature");
 		minTemperatureSet = server.arg("min_temperature").toInt();
 		EEPROM.put(260, minTemperatureSet);
 		EEPROM.commit();
+		changed = true;
 	}
+	if (changed) {
+		lastTimeCycle = -5000; // trigger timer()
 		reload_settings();
-	server.setContentLength(strlen(settings_html_pre) + strlen(settings_html));
-	server.send(301, "text/html", settings_html_pre);
-	server.sendContent(settings_html);
+		server.sendHeader(F("Location"), F("/settings"), true);
+		server.send(302);
+	} else {
+		server.send(204); // nothing changed (except maybe current temperature),
+						  // so no page update needed
+	}
 }
 
 void timer() {
+	if (millis() - lastTimeCycle > 5000) {
 		int ri = 0;
 		bool isOn = false;
 		while (ri <= 7) {
@@ -277,7 +288,7 @@ void timer() {
 			sprintf(t_stat[r], "on");
 			if (!override[r]) {
 				digitalWrite(pins[r], HIGH);
-			digitalWrite(2, HIGH); // LED
+				analogWrite(LED_BUILTIN_AUX, 100); // LED
 				if (strcmp(stat[r], "AUS") == 0) {
 					debug(r);
 					debugln(F(" is on"));
@@ -291,7 +302,7 @@ void timer() {
 			sprintf(t_stat[r], "off");
 			if (!override[r]) {
 				digitalWrite(pins[r], LOW);
-			digitalWrite(2, LOW); // LED
+				analogWrite(LED_BUILTIN, 0);	 // LED
 				if (strcmp(stat[r], "AN") == 0) {
 					debug(r);
 					debugln(F(" is off"));
@@ -299,25 +310,51 @@ void timer() {
 				}
 			}
 		}
+		lastTimeCycle = millis();
+	}
+}
+
+
+void emergencyStop() {
+	for (uint pin = 0; pin < sizeof(pins) / sizeof(pins[0]); pin++) {
+		debug("Emergency stop, pulling down pin: ");
+		debugln(pin);
+		digitalWrite(pins[pin], LOW);
+	}
+	server.close();
+	char apSSID[32];
+	sprintf(apSSID, "ESP-%06X has an issue", ESP.getChipId());
+	WiFi.softAP(apSSID, "", 1, false, 0);
+	unsigned long lastTry = millis();
+	while (millis() - lastTry < (1000 * 60)) {
+		analogWrite(LED_BUILTIN, 255);
+		delay(125);
+		analogWrite(LED_BUILTIN, 0);
+		delay(125);
+		analogWrite(LED_BUILTIN, 255);
+		delay(250);
+	}
+	ESP.restart();
 }
 
 void getCurrentTemperature() {
 	if (millis() - lastTempCycle > 5000) {
 		sensors.requestTemperatures();
-		temperature = int(sensors.getTempCByIndex(0)) != -127
-						  ? int(sensors.getTempCByIndex(0))
-						  : 255; // TODO: mark as invalid
+		temperature = int(sensors.getTempCByIndex(0));
 		lastTempCycle = millis();
-		debugln(temperature);
+		if (temperature == -127) {
+			emergencyStop();
+		}
 	}
 }
+
 void setup() {
-	int p = 0;
-	while (p <= 7) {
+	pinMode(LED_BUILTIN, OUTPUT);
+	analogWrite(LED_BUILTIN, 255);
+	uint p = 0;
+	while (p <= sizeof(pins) / sizeof(pins[0])) {
 		pinMode(pins[p], OUTPUT);
-		pinMode(2, OUTPUT);
 		digitalWrite(pins[p], LOW);
-		digitalWrite(2, LOW); // LED
 		p++;
 	}
 	Serial.begin(74880);
@@ -332,12 +369,13 @@ void setup() {
 
 	// WiFI-config
 	// WiFi.mode(WIFI_STA); // comment to force use of staticIP
-	WiFi.hostname("ESP8266 IOT development");
-	WiFi.config(staticIP, gateway, subnet, dns);
+	// WiFi.config(staticIP, gateway, subnet, dns);
+	WiFi.hostname("esp8266-iot-dev");
 	WiFi.begin(SSID, PASSWORD);
 
 	uint32_t notConnectedCounter = 0;
-	debug(F("Connecting "));
+	debug(F("Connecting to "));
+	debugln(WiFi.SSID());
 	while (WiFi.status() != WL_CONNECTED) {
 		delay(250);
 		debug(F("."));
@@ -357,13 +395,14 @@ void setup() {
 	// Time-config
 	myTime.setLocation("de");
 	// setServer("192.168.2.1"); // uncomment to set custom NTP server
-	if (!waitForSync(5000)) {
+	if (!waitForSync(TIMEZONED_TIMEOUT / 1000)) {
+		// Reset instead of using fallback timezone
 		debugln("\nResetting due to NTP not syncing");
 		ESP.restart();
 	}
 	debug(F("Local time: "));
 	debugln(myTime.dateTime("H:i:s"));
-	setInterval();
+	setInterval(60 * 60 * 11); // + NTP_STALE_AFTER=3602 = sync every ~ 12 h
 
 	// Server-config
 	server.on("/", HTTP_GET, handleHome);
@@ -373,8 +412,10 @@ void setup() {
 	server.on("/reset", HTTP_GET, handleReset);
 	server.on("/restart", HTTP_GET, handleRestart);
 	server.on("/version", HTTP_GET, [] {
-		server.send(200, "text/html",
-					BUILD_VERSION + BUILD_DEBUG ? "-debug" : "");
+		char softwareVersion[32];
+		sprintf(softwareVersion, "%s%s", BUILD_VERSION,
+				BUILD_DEBUG ? "-debug" : "");
+		server.send(200, "text/html", softwareVersion);
 	});
 
 	getCurrentTemperature();
@@ -388,5 +429,6 @@ void loop() {
 	timer();
 	yield();
 	delay(50);
+	events();
 	ArduinoOTA.handle();
 }