Updates for reliable NTP

examples/src/micropython/main.py

@@ -22,7 +22,9 @@ def connect_wifi():
     wlan.active(True)
     wlan.connect(SSID, PASS)
 
-    # Wait for the connection (esp32 can take some time)
+    while not wlan.isconnected():
+        try:
+            wlan.connect(ssid, password)
             max_wait = 10
             while max_wait > 0:
                 if wlan.isconnected():
@@ -30,6 +32,14 @@ def connect_wifi():
                 max_wait -= 1
                 print('Waiting for connection...')
                 sleep(1)
+            if wlan.isconnected():
+                print('Connected to Wi-Fi')
+                print('Network config:', wlan.ifconfig())
+                break
+        except Exception as e:
+            print('Connection error:', e)
+        print('Retrying connection...')
+        sleep(2)
 
 def init_LEDs():
     # Sets up LEDs and their ports.
@@ -40,13 +50,8 @@ def init_LEDs():
 connect_wifi()
 
 # Synchronize time of RTC with NTP
-try:
-    ntptime.settime()
-    print("Time synchronized successfully")
-except Exception as e:
-    print("Error synchronizing time:", e)
-
-last_query = mktime([2000,1,1,0,0,0,0,0]) # Set last query default (will run on first run)
+last_ntp_sync = -3700 # Init as more than an hour ago
+last_api_query = mktime([2000,1,1,0,0,0,0,0]) # Set last query default (will run on first run)
 query_period = 120 # Query the API at most every 2 minutes
 distance_on = 10 # Time from station before turning on LED
 
@@ -202,8 +207,17 @@ init_LEDs()
 
 
 while(True):
+    # Synchronise NTP time if hasn't been done in 1 hour
+    if (time() - last_ntp_sync) > 3600:
+        try:
+            ntptime.settime()
+            print("Time synchronized successfully")
+            last_ntp_sync = time()
+        except Exception as e:
+            print("Error synchronizing time:", e)
+            
     # Have we queried API in the query_period seconds?
-    if (time() - last_query) > query_period:
+    if (time() - last_api_query) > query_period:
         # Query updated API
         trains = (requests.get("https://lapi.transitchicago.com/api/1.0/ttpositions.aspx?key="+APIKEY+"&rt=Blue&outputType=JSON")).json()['ctatt']
         
@@ -219,9 +233,7 @@ while(True):
             stations[nextStation]['eta'].append(eta_time)
         
         
-        last_query = time() # uptime polling window
-        print(gmtime(last_query))
-        
+        last_api_query = time() # uptime polling window        
         
     
     # Process the ETA for each station