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Feed-WDT.py

@@ -0,0 +1,108 @@
+import serial
+import serial.tools.list_ports
+import socket
+import sys
+import time
+import traceback
+from threading import Timer
+
+class RepeatedTimer(object):
+    def __init__(self, interval, function, *args, **kwargs):
+        self._timer     = None
+        self.interval   = interval
+        self.function   = function
+        self.args       = args
+        self.kwargs     = kwargs
+        self.is_running = False
+        self.start()
+
+    def _run(self):
+        self.is_running = False
+        self.start()
+        self.function(*self.args, **self.kwargs)
+
+    def start(self):
+        if not self.is_running:
+            self._timer = Timer(self.interval, self._run)
+            self._timer.start()
+            self.is_running = True
+
+    def stop(self):
+        self._timer.cancel()
+        self.is_running = False
+
+def feedWDT (s):
+    sendSerChar (s, b'A')
+
+def sendSerChar (s, c):
+    print ('Sending ' + str (c))
+    s.write(c)
+       
+def find_arduino_leonardo():
+    # Scan for available COM ports
+    ports = serial.tools.list_ports.comports()
+    for port in ports:
+	# Check if "LattePanda Leonardo" is in the description of any found port
+        if "LattePanda Leonardo" in port.description:
+            return port.device
+    return None
+ 
+def main():
+    try:
+        # Locate the Arduino Leonardo on the LattePanda board
+        device = find_arduino_leonardo()
+		
+	# Exit if the device is not found
+        if device is None:
+            print("LattePanda Leonardo device not found. Please check if the device is connected and drivers are installed.")
+            input("Press any key to exit...")
+            sys.exit(1)
+		
+	# Open a Serial connection to the Arduino Leonardo
+        ser = serial.Serial(device, 9600)
+        
+        # Start a repeating timer to feed the watchdog 
+        rt  = RepeatedTimer (30, feedWDT, ser) # it auto-starts, no need of rt.start()
+        
+        # Setup a listening socket
+        s = socket.socket (socket.AF_INET, socket.SOCK_STREAM)
+        s.bind (('localhost', 9999))
+        s.listen (5)
+        print ('Server is listening')        
+        
+        while True:
+            print ('Waiting for connection...')
+
+            c, addr = s.accept ()
+
+            print ('Got connection from', addr)
+            
+            data = c.recv (1).decode ('utf-8')
+            if not data:
+                continue
+
+            print ('From online user: ' + data)
+
+            if (data == 'T'):
+                break
+
+            b = bytes (data, 'utf-8')
+            sendSerChar (ser, b)
+            
+            c.close()
+            
+            if (data == 'Q'):
+                break
+
+        RepeatedTimer.stop (rt)
+
+    except Exception as e:
+        # Handle exceptions and print the error message
+        print("An error occurred:")
+        print(str(e))
+        print(traceback.format_exc())
+        input("Press any key to exit...")
+ 
+if __name__ == "__main__":
+    main()
+