Add Microtrak APRS parser. (https://microtrak.fr/)

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ## unreleased
 - client: If no reference_timestamp provided use timestamp from APRS server (fixes #85)
+- parser: Handle dst_calls 'OGFLR6' (protocol 6) and 'OGFLR7' (protocol 7) like 'OGFLR' (fixes #123)
+- parser: Added support for OGNMTK (Microtrak) beacons
 
 ## 1.2.1: - 2021-06-06
 - client: Added peer IP to log messages

ogn/parser/aprs_comment/microtrak_parser.py

@@ -0,0 +1,23 @@
+from ogn.parser.pattern import PATTERN_MICROTRAK_POSITION_COMMENT
+
+from .base import BaseParser
+
+
+class MicrotrakParser(BaseParser):
+    def __init__(self):
+        self.beacon_type = 'microtrak'
+        self.position_pattern = PATTERN_MICROTRAK_POSITION_COMMENT
+
+    def parse_position(self, aprs_comment):
+        match = self.position_pattern.match(aprs_comment)
+
+        result = {}
+        if match.group('details'):
+            result.update({
+                'address_type': int(match.group('details'), 16) & 0b00000011,
+                'aircraft_type': (int(match.group('details'), 16) & 0b00111100) >> 2,
+                'no-tracking': (int(match.group('details'), 16) & 0b01000000) >> 6 == 1,
+                'stealth': (int(match.group('details'), 16) & 0b10000000) >> 7 == 1,
+                'address': match.group('address'),
+            })
+        return result

ogn/parser/parse.py

@@ -17,6 +17,7 @@ from ogn.parser.aprs_comment.spider_parser import SpiderParser
 from ogn.parser.aprs_comment.spot_parser import SpotParser
 from ogn.parser.aprs_comment.inreach_parser import InreachParser
 from ogn.parser.aprs_comment.safesky_parser import SafeskyParser
+from ogn.parser.aprs_comment.microtrak_parser import MicrotrakParser
 from ogn.parser.aprs_comment.generic_parser import GenericParser
 
 positions = {}
@@ -167,6 +168,7 @@ dstcall_parser_mapping = {'APRS': OgnParser(),
                           'OGSPID': SpiderParser(),
                           'OGSPOT': SpotParser(),
                           'OGNSKY': SafeskyParser(),
+                          'OGNMTK': MicrotrakParser(),
                           'GENERIC': GenericParser(beacon_type='unknown'),
                           }
 

ogn/parser/pattern.py

@@ -88,6 +88,10 @@ PATTERN_SAFESKY_POSITION_COMMENT = re.compile(r"""
     (?:gps(?P<gps_quality>(?P<gps_quality_horizontal>(\d+))x(?P<gps_quality_vertical>(\d+)))?)?
 """, re.VERBOSE | re.MULTILINE)
 
+PATTERN_MICROTRAK_POSITION_COMMENT = re.compile(r"""
+    id(?P<details>[\dA-F]{2})(?P<address>[\dA-F]{6}?)\s?
+""", re.VERBOSE | re.MULTILINE)
+
 PATTERN_TRACKER_STATUS_COMMENT = re.compile(r"""
     h(?P<hardware_version>[\d]{2})\s
     v(?P<software_version>[\d]{2})\s?

tests/parser/test_parse_microtrak.py

@@ -0,0 +1,25 @@
+import unittest
+
+from ogn.parser.aprs_comment.microtrak_parser import MicrotrakParser
+
+
+class TestStringMethods(unittest.TestCase):
+    def test_position_comment(self):
+        message = MicrotrakParser().parse_position("id21A8CBA8")
+
+        self.assertEqual(message['address_type'], 1)
+        self.assertEqual(message['aircraft_type'], 8)
+        self.assertFalse(message['stealth'])
+        self.assertFalse(message['no-tracking'])
+        self.assertEqual(message['address'], "A8CBA8")
+
+    def test_position_comment_relevant_keys_only(self):
+        # return only keys where we got informations
+        message = MicrotrakParser().parse_position("id21A8CBA8")
+
+        self.assertIsNotNone(message)
+        self.assertEqual(sorted(message.keys()), sorted(['address_type', 'aircraft_type', 'stealth', 'address', 'no-tracking']))
+
+
+if __name__ == '__main__':
+    unittest.main()

tests/parser/valid_beacon_data/microtrak.txt

@@ -0,0 +1,6 @@
+# The following beacons are example for Microtrak's APRS format
+# source: https://github.com/glidernet/ogn-aprs-protocol
+#
+MTK895B2D>OGNMTK,qAS,Microtrak:/195300h4849.11N/00216.49E'000/000/A=000472 !W72! id07895B2D
+MTK895B2D>OGNMTK,qAS,Microtrak:/195300h4849.11N/00216.49E'000/000/A=000472 !W72! id07895B2D
+MTK6FC895>OGNMTK,qAS,Microtrak:/195346h4849.09N/00216.52E'000/000/A=000295 !W18! id076FC895