Fix issue 80: Weather packet decoding.

aprslib/parsing/common.py

@@ -138,14 +138,15 @@ def parse_data_extentions(body):
     # course speed bearing nrq
     # Page 27 of the spec
     # format: 111/222/333/444text
+    # Speed is in mph
     match = re.findall(r"^([0-9 \.]{3})/([0-9 \.]{3})", body)
     if match:
         cse, spd = match[0]
         body = body[7:]
         if cse.isdigit() and cse != "000":
             parsed.update({'course': int(cse) if 1 <= int(cse) <= 360 else 0})
         if spd.isdigit() and spd != "000":
-            parsed.update({'speed': int(spd)*1.852})
+            parsed.update({'speed': int(spd)})
 
         # DF Report format
         # Page 29 of teh spec

aprslib/parsing/position.py

@@ -63,10 +63,19 @@ def parse_position(packet_type, body):
         # attempt to parse winddir/speed
         # Page 92 of the spec
         body, result = parse_data_extentions(body)
-        parsed.update(result)
+        wind_speed = result.get("speed")
+        wind_direction = result.get("course")
 
         logger.debug("Attempting to parse weather report from comment")
         body, result = parse_weather_data(body)
+        if wind_speed:
+            result.update({
+                'wind_speed': wind_speed,
+            })
+        if wind_direction:
+            result.update({
+                'wind_direction': wind_direction,
+            })
         parsed.update({
             'comment': body.strip(' '),
             'weather': result,

aprslib/parsing/weather.py

@@ -7,8 +7,10 @@
     ]
 
 # constants
-wind_multiplier = 0.44704
-rain_multiplier = 0.254
+# wind is in miles per hour
+wind_multiplier = 1
+# Spec 1.1 Rain is in hundredths of an inch.
+rain_multiplier = 0.01
 
 key_map = {
     'g': 'wind_gust',

tests/test_parse_common.py

@@ -253,7 +253,7 @@ def test_course_speed(self):
         self.assertEqual(remaining, '/text')
         self.assertEqual(parsed, {
             'course': 123,
-            'speed': 100*1.852,
+            'speed': 100,
             })
 
     def test_course_speed_spaces(self):
@@ -305,7 +305,7 @@ def test_empty_bearing_nrq(self):
         self.assertEqual(remaining, 'text')
         self.assertEqual(parsed, {
             'course': 111,
-            'speed': 100*1.852,
+            'speed': 100,
             })
 
         body = "111/100/2  /33.text"
@@ -314,7 +314,7 @@ def test_empty_bearing_nrq(self):
         self.assertEqual(remaining, 'text')
         self.assertEqual(parsed, {
             'course': 111,
-            'speed': 100*1.852,
+            'speed': 100,
             })
 
     def test_course_speed_bearing_nrq_empty_cse_speed(self):
@@ -335,7 +335,7 @@ def test_course_speed_bearing_nrq(self):
         self.assertEqual(remaining, 'text')
         self.assertEqual(parsed, {
             'course': 123,
-            'speed': 100*1.852,
+            'speed': 100,
             'bearing': 234,
             'nrq': 345,
             })

tests/test_parse_position.py

@@ -30,7 +30,7 @@ def test_position_packet_only_weather_valid(self):
                 'wind_gust': 0.0,
                 'temperature': 18.88888888888889,
                 'rain_1h': 0.0,
-                'rain_24h': 0.0
+                'rain_24h': 0.0,
             }
         }
 
@@ -50,14 +50,14 @@ def test_position_packet_data_ext_and_weather_valid(self):
             'symbol_table': '/',
             'latitude': 49.05833333333333,
             'longitude': -72.02916666666667,
-            'course': 90,
-            'speed': 1*1.852,
             'comment': '...dUII',
             'weather': {
                 'wind_gust': 0.0,
                 'temperature': 18.88888888888889,
                 'rain_1h': 0.0,
-                'rain_24h': 0.0
+                'rain_24h': 0.0,
+                'wind_direction': 90,
+                'wind_speed': 1,
             }
         }
 
@@ -77,13 +77,13 @@ def test_position_packet_optional_speed(self):
             'symbol_table': '/',
             'latitude': 49.05833333333333,
             'longitude': -72.02916666666667,
-            'course': 90,
             'comment': '...dUII',
             'weather': {
                 'wind_gust': 0.0,
                 'temperature': 18.88888888888889,
                 'rain_1h': 0.0,
-                'rain_24h': 0.0
+                'rain_24h': 0.0,
+                'wind_direction': 90
             }
         }
 
@@ -103,13 +103,13 @@ def test_position_packet_optional_course(self):
             'symbol_table': '/',
             'latitude': 49.05833333333333,
             'longitude': -72.02916666666667,
-            'speed': 1*1.852,
             'comment': '...dUII',
             'weather': {
                 'wind_gust': 0.0,
                 'temperature': 18.88888888888889,
                 'rain_1h': 0.0,
-                'rain_24h': 0.0
+                'rain_24h': 0.0,
+                'wind_speed': 1,
             }
         }
 
@@ -153,13 +153,13 @@ def test_position_packet_optional_course(self):
             'symbol_table': '/',
             'latitude': 49.05833333333333,
             'longitude': -72.02916666666667,
-            'speed': 1*1.852,
             'comment': '...dUII',
             'weather': {
                 'wind_gust': 0.0,
                 'temperature': 18.88888888888889,
                 'rain_1h': 0.0,
-                'rain_24h': 0.0
+                'rain_24h': 0.0,
+                'wind_speed': 1,
             }
         }
 

tests/test_parse_weather_data.py

@@ -3,8 +3,8 @@
 from aprslib.parsing import parse_weather_data
 from aprslib.parsing import parse
 
-wind_multiplier = 0.44704
-mm_multiplier = 0.254
+wind_multiplier = 1
+mm_multiplier = 0.010
 
 class ParseCommentWeather(unittest.TestCase):
     def setUp(self):