Add support for MTA sentence (#170)

pynmea2/types/talker.py

@@ -559,6 +559,13 @@ def localdatetime(self):
         return d.astimezone(self.tzinfo)
 
 
+class MTA(TalkerSentence):
+    """ Air Temperature (to be phased out)
+    """
+    fields = (
+        ("Air temperature", "temperature", Decimal),
+        ("Units of measurement", "units"),
+    )
 
 
 # Implemented by Janez Stupar for Visionect
@@ -885,12 +892,6 @@ class TTM(TalkerSentence):
     #    fields = (
     # )
 
-#class MTA(TalkerSentence):
-#    """ Air Temperature (to be phased out)
-#    """
-    #    fields = (
-    # )
-
 #class OLN(TalkerSentence):
 #    """ Omega Lane Numbers
 #    """

test/test_types.py

@@ -340,4 +340,14 @@ def test_HEV():
     assert isinstance(msg, pynmea2.HEV)
     assert msg.talker == "GP"
     assert msg.sentence_type == "HEV"
-    assert msg.heave == -0.01
+    assert msg.heave == -0.01
+
+
+def test_MTA():
+    data = "$WIMTA,010.0,C*2A"
+    msg = pynmea2.parse(data)
+    assert msg.render() == data
+    assert msg.talker == 'WI'
+    assert msg.sentence_type == 'MTA'
+    assert msg.temperature == 10.0
+    assert msg.units == 'C'