🐛 Fixes memory overflow and removes server health check

peripheral/main.py

@@ -1,3 +1,4 @@
+import gc
 import utime
 import ujson
 import network
@@ -17,6 +18,7 @@ class App:
 
     opened: bool = False
     previously_opened: bool = False
+    wlan: network.WLAN
 
     led = Pin(15, Pin.OUT)
     trigger = Pin(2, Pin.OUT)
@@ -55,18 +57,18 @@ class App:
 
     def connect(self):
         print("Connecting to Wi-Fi...")
-        wlan = network.WLAN(network.STA_IF)
+        self.wlan = network.WLAN(network.STA_IF)
 
-        wlan.active(False)
+        self.wlan.active(False)
         utime.sleep_ms(250)
-        wlan.active(True)
+        self.wlan.active(True)
         utime.sleep_ms(250)
 
-        wlan.connect(self.ssid, self.password)
+        self.wlan.connect(self.ssid, self.password)
         utime.sleep_ms(100)
 
         retry_count = 0
-        while not wlan.isconnected():
+        while not self.wlan.isconnected():
             if retry_count >= MAX_CONNECTION_RETRIES:
                 print("Max connection retries reached")
                 exit(1)
@@ -80,22 +82,14 @@ class App:
 
             if retry_count % 10 == 0:
                 print("Attempting to restart connection...")
-                wlan.connect(self.ssid, self.password)
+                self.wlan.connect(self.ssid, self.password)
                 for _ in range(10):
                     self.led.toggle()
                     utime.sleep_ms(50)
 
-        print(f"Connected with IP {wlan.ifconfig()[0]}")
+        print(f"Connected with IP {self.wlan.ifconfig()[0]}")
         self.update_server()
 
-    def health_check_server(self):
-        print("Health checking server...", end="\r")
-        try:
-            r = urequests.get(f"{self.server}/")
-            print(f"Server healthy [{r.status_code}]{" " * 8}")
-        except Exception as e:
-            print(f"Error occurred: {e}")
-
     def update_server(self):
         print("Updating state...", end="\r")
         data = {"opened": self.opened}
@@ -128,7 +122,7 @@ class App:
 
         delta_time = received_time - sent_time
         distance = delta_time / 1_000_000 * SOUND_SPEED / 2
-        print(f"Distance: {distance} cm")
+        print(f"Distance: {distance:0<5} cm; mem_free = {gc.mem_free()}")
 
         return distance
 
@@ -139,6 +133,9 @@ class App:
         i = 0
         while True:
             try:
+                if not self.wlan.isconnected():
+                    self.connect()
+
                 distance = self.measure_distance()
                 self.opened = distance >= THRESHOLD_DISTANCE
 
@@ -157,13 +154,14 @@ class App:
                         self.previously_opened = True
 
                 if i >= 20:
+                    print("Blinking...")
                     self.led.toggle()
                     utime.sleep_ms(100)
                     self.led.toggle()
                     utime.sleep_ms(400)
 
                     i = 0
-                    self.health_check_server()
+                    gc.collect()
                 else:
                     utime.sleep_ms(500)