keep Wifi connected for 1 min at startup

platformio.ini

@@ -17,6 +17,6 @@ lib_deps =
 	adafruit/Adafruit LED Backpack Library@^1.1.8
 	adafruit/Adafruit BusIO@^1.6.0
 	jchristensen/Timezone@^1.2.4
+;upload_port = /dev/ttyUSB0
 ;upload_port = 192.168.5.191
-upload_port = /dev/ttyUSB0
 ;upload_protocol = espota

src/esp_clock.cpp

@@ -23,6 +23,7 @@ TimeChangeRule CET = {"CET ", Last, Sun, Oct, 3, 60};       // Central European
 Timezone CE(CEST, CET);
 
 int currentHour = -1;
+time_t timeAtStartup;
 
 String currentSSID;
 String currentPsk;
@@ -34,6 +35,7 @@ void displayTime();
 void displayColon(bool on);
 void setupOTA();
 void printWiFiStatus();
+time_t updateTime();
 
 void setup() {
   Serial.begin(9600);                      // Start the serial console
@@ -56,6 +58,7 @@ void setup() {
   clockDisplay.setBrightness(BRIGHTNESS);
 
   timeClient.begin();
+  timeAtStartup = updateTime();
 }
 
 void loop() {
@@ -71,14 +74,16 @@ void loop() {
       }
     }
     printWiFiStatus();
-    if (WiFi.status() == WL_CONNECTED && timeClient.forceUpdate()) {
-      time_t newTime = CE.toLocal(timeClient.getEpochTime());
-      setTime(newTime);
-      Serial.println(asctime(localtime(&newTime)));
+    if (WiFi.status() == WL_CONNECTED) {
+      if (time_t newTime = updateTime()) Serial.println(asctime(localtime(&newTime)));
     }
-    WiFi.forceSleepBegin();
     currentHour = hour();
   }
+  if (WiFi.status() == WL_CONNECTED && difftime(now(), timeAtStartup) > 60) {
+    Serial.println("Disconnecting WiFi");
+    WiFi.disconnect();
+    WiFi.forceSleepBegin();
+  }
   displayTime();
   displayColon(true);
   delay(500);
@@ -110,6 +115,16 @@ void displayColon(bool on) {
 	  clockDisplay.writeDisplay();
 }
 
+time_t updateTime() {
+  if (timeClient.forceUpdate()) {
+    time_t newTime = CE.toLocal(timeClient.getEpochTime());
+    setTime(newTime);
+    return newTime;
+  } else {
+    return 0;
+  }
+}
+
 void setupOTA() {
 	  ArduinoOTA.onStart([]() {
 	    Serial.println("Start");