PositionReport: validate lat and long

added input validation for latitude and longitude

aprslib/packets/position.py

@@ -5,8 +5,31 @@ from aprslib.util import latitude_to_ddm, longitude_to_ddm, comment_altitude
 
 class PositionReport(APRSPacket):
     format = 'uncompressed'
-    latitude = 0
-    longitude = 0
+
+    _latitude = 0
+    @property
+    def latitude(self):
+        return self._latitude
+
+    @latitude.setter
+    def latitude(self, val):
+        if -90 <= val <= 90:
+            self._latitude = val
+        else:
+            raise ValueError("Latitude outside of -90 to 90 degree range")
+
+    _longitude = 0
+    @property
+    def longitude(self):
+        return self._longitude
+
+    @longitude.setter
+    def longitude(self, val):
+        if -180 <= val <= 180:
+            self._longitude = val
+        else:
+            raise ValueError("Longitude outside of -180 to 180 degree range")
+
     symbol_table = '/'
     symbol = 'l'
     altitude = None