Add APRS device tracker component

This component keeps open a connection to the APRS-IS infrastructure so
messages generated by filtered callsigns can be immediately acted upon.
Any messages with certain values for the 'format' key are position
reports and are parsed into device tracker entities.

CODEOWNERS

@@ -23,6 +23,7 @@ homeassistant/components/alpha_vantage/* @fabaff
 homeassistant/components/amazon_polly/* @robbiet480
 homeassistant/components/ambient_station/* @bachya
 homeassistant/components/api/* @home-assistant/core
+homeassistant/components/aprs/* @PhilRW
 homeassistant/components/arduino/* @fabaff
 homeassistant/components/arest/* @fabaff
 homeassistant/components/asuswrt/* @kennedyshead

homeassistant/components/aprs/__init__.py

@@ -0,0 +1 @@
+"""The APRS component."""

homeassistant/components/aprs/device_tracker.py

@@ -0,0 +1,186 @@
+"""Support for APRS device tracking."""
+
+import logging
+import threading
+
+import voluptuous as vol
+
+from homeassistant.components.device_tracker import (
+    ATTR_GPS_ACCURACY, ATTR_LATITUDE, ATTR_LONGITUDE, PLATFORM_SCHEMA)
+from homeassistant.const import (
+    CONF_HOST, CONF_PASSWORD, CONF_TIMEOUT, CONF_USERNAME,
+    EVENT_HOMEASSISTANT_STOP)
+from homeassistant.exceptions import PlatformNotReady
+import homeassistant.helpers.config_validation as cv
+from homeassistant.util import slugify
+
+DOMAIN = 'aprs'
+
+_LOGGER = logging.getLogger(__name__)
+
+ATTR_ALTITUDE = 'altitude'
+ATTR_COURSE = 'course'
+ATTR_COMMENT = 'comment'
+ATTR_FROM = 'from'
+ATTR_FORMAT = 'format'
+ATTR_POS_AMBIGUITY = 'posambiguity'
+ATTR_SPEED = 'speed'
+
+CONF_CALLSIGNS = 'callsigns'
+
+DEFAULT_HOST = 'rotate.aprs2.net'
+DEFAULT_PASSWORD = '-1'
+DEFAULT_TIMEOUT = 30.0
+
+FILTER_PORT = 14580
+
+MSG_FORMATS = ['compressed', 'uncompressed', 'mic-e']
+
+PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({
+    vol.Required(CONF_CALLSIGNS): cv.ensure_list,
+    vol.Required(CONF_USERNAME): cv.string,
+    vol.Optional(CONF_PASSWORD,
+                 default=DEFAULT_PASSWORD): cv.string,
+    vol.Optional(CONF_HOST,
+                 default=DEFAULT_HOST): cv.string,
+    vol.Optional(CONF_TIMEOUT,
+                 default=DEFAULT_TIMEOUT): vol.Coerce(float)
+})
+
+
+def make_filter(callsigns: list) -> str:
+    """Make a server-side filter from a list of callsigns."""
+    return ' '.join('b/{0}'.format(cs.upper()) for cs in callsigns)
+
+
+def gps_accuracy(gps, posambiguity: int) -> int:
+    """Calculate the GPS accuracy based on APRS posambiguity."""
+    import geopy.distance
+
+    pos_a_map = {0: 0,
+                 1: 1 / 600,
+                 2: 1 / 60,
+                 3: 1 / 6,
+                 4: 1}
+    if posambiguity in pos_a_map:
+        degrees = pos_a_map[posambiguity]
+
+        gps2 = (gps[0], gps[1] + degrees)
+        dist_m = geopy.distance.distance(gps, gps2).m
+
+        accuracy = round(dist_m)
+    else:
+        message = "APRS position ambiguity must be 0-4, not '{0}'.".format(
+            posambiguity)
+        raise ValueError(message)
+
+    return accuracy
+
+
+def setup_scanner(hass, config, see, discovery_info=None):
+    """Set up the APRS tracker."""
+    callsigns = config.get(CONF_CALLSIGNS)
+    server_filter = make_filter(callsigns)
+
+    callsign = config.get(CONF_USERNAME)
+    password = config.get(CONF_PASSWORD)
+    host = config.get(CONF_HOST)
+    timeout = config.get(CONF_TIMEOUT)
+    aprs_listener = AprsListenerThread(
+        callsign, password, host, server_filter, see)
+
+    def aprs_disconnect(event):
+        """Stop the APRS connection."""
+        aprs_listener.stop()
+
+    aprs_listener.start()
+    hass.bus.listen_once(EVENT_HOMEASSISTANT_STOP, aprs_disconnect)
+
+    if not aprs_listener.start_event.wait(timeout):
+        raise PlatformNotReady("Timeout waiting for APRS to connect.")
+
+    if not aprs_listener.start_success:
+        raise PlatformNotReady(aprs_listener.start_message)
+
+    _LOGGER.debug(aprs_listener.start_message)
+    return True
+
+
+class AprsListenerThread(threading.Thread):
+    """APRS message listener."""
+
+    def __init__(self, callsign: str, password: str, host: str,
+                 server_filter: str, see):
+        """Initialize the class."""
+        super().__init__()
+
+        import aprslib
+
+        self.callsign = callsign
+        self.host = host
+        self.start_event = threading.Event()
+        self.see = see
+        self.server_filter = server_filter
+        self.start_message = ""
+        self.start_success = False
+
+        self.ais = aprslib.IS(
+            self.callsign, passwd=password, host=self.host, port=FILTER_PORT)
+
+    def start_complete(self, success: bool, message: str):
+        """Complete startup process."""
+        self.start_message = message
+        self.start_success = success
+        self.start_event.set()
+
+    def run(self):
+        """Connect to APRS and listen for data."""
+        self.ais.set_filter(self.server_filter)
+        from aprslib import ConnectionError as AprsConnectionError
+        from aprslib import LoginError
+
+        try:
+            _LOGGER.info("Opening connection to %s with callsign %s.",
+                         self.host, self.callsign)
+            self.ais.connect()
+            self.start_complete(
+                True,
+                "Connected to {0} with callsign {1}.".format(
+                    self.host, self.callsign))
+            self.ais.consumer(callback=self.rx_msg, immortal=True)
+        except (AprsConnectionError, LoginError) as err:
+            self.start_complete(False, str(err))
+        except OSError:
+            _LOGGER.info("Closing connection to %s with callsign %s.",
+                         self.host, self.callsign)
+
+    def stop(self):
+        """Close the connection to the APRS network."""
+        self.ais.close()
+
+    def rx_msg(self, msg: dict):
+        """Receive message and process if position."""
+        _LOGGER.debug("APRS message received: %s", str(msg))
+        if msg[ATTR_FORMAT] in MSG_FORMATS:
+            dev_id = slugify(msg[ATTR_FROM])
+            lat = msg[ATTR_LATITUDE]
+            lon = msg[ATTR_LONGITUDE]
+
+            attrs = {}
+            if ATTR_POS_AMBIGUITY in msg:
+                pos_amb = msg[ATTR_POS_AMBIGUITY]
+                try:
+                    attrs[ATTR_GPS_ACCURACY] = gps_accuracy((lat, lon),
+                                                            pos_amb)
+                except ValueError:
+                    _LOGGER.warning(
+                        "APRS message contained invalid posambiguity: %s",
+                        str(pos_amb))
+            for attr in [ATTR_ALTITUDE,
+                         ATTR_COMMENT,
+                         ATTR_COURSE,
+                         ATTR_SPEED]:
+                if attr in msg:
+                    attrs[attr] = msg[attr]
+
+            self.see(dev_id=dev_id, gps=(lat, lon), attributes=attrs)

homeassistant/components/aprs/manifest.json

@@ -0,0 +1,11 @@
+{
+  "domain": "aprs",
+  "name": "APRS",
+  "documentation": "https://www.home-assistant.io/components/aprs",
+  "dependencies": [],
+  "codeowners": ["@PhilRW"],
+  "requirements": [
+    "aprslib==0.6.46",
+    "geopy==1.19.0"
+  ]
+}

requirements_all.txt

@@ -178,6 +178,9 @@ apcaccess==0.0.13
 # homeassistant.components.apns
 apns2==0.3.0
 
+# homeassistant.components.aprs
+aprslib==0.6.46
+
 # homeassistant.components.aqualogic
 aqualogic==1.0
 
@@ -475,6 +478,9 @@ geniushub-client==0.3.6
 # homeassistant.components.usgs_earthquakes_feed
 geojson_client==0.3
 
+# homeassistant.components.aprs
+geopy==1.19.0
+
 # homeassistant.components.geo_rss_events
 georss_generic_client==0.2
 

requirements_test_all.txt

@@ -60,6 +60,9 @@ aiounifi==4
 # homeassistant.components.apns
 apns2==0.3.0
 
+# homeassistant.components.aprs
+aprslib==0.6.46
+
 # homeassistant.components.stream
 av==6.1.2
 
@@ -111,6 +114,9 @@ gTTS-token==1.1.3
 # homeassistant.components.usgs_earthquakes_feed
 geojson_client==0.3
 
+# homeassistant.components.aprs
+geopy==1.19.0
+
 # homeassistant.components.geo_rss_events
 georss_generic_client==0.2
 

script/gen_requirements_all.py

@@ -50,6 +50,7 @@
     'aiounifi',
     'aioswitcher',
     'apns2',
+    'aprslib',
     'av',
     'axis',
     'caldav',
@@ -63,6 +64,7 @@
     'feedparser-homeassistant',
     'foobot_async',
     'geojson_client',
+    'geopy',
     'georss_generic_client',
     'georss_ign_sismologia_client',
     'google-api-python-client',

tests/components/aprs/__init__.py

@@ -0,0 +1 @@
+"""Tests for the APRS component."""