python/iot3: implement mobility SDK

[ymorin-orange]

Features:

• Closes: Exchange mobility message for user equipement #132

---

Preparation:

1. if you do not have a gpsd server listening on localhost:2947, spawn one (needs gpsd 3.24 or later):
   • grab the NMEA sample on Wikipedia and save it in a file called NMEA.log
   • start a gpsfake using that file to emulate a GNSS device:

     TMPDIR=/tmp gpsfake -q -P 2947 -o=-G -u -n -c 0.1 NMEA.log

2. if you do not have python 3.11 or later, you can use the following to create a container to run all the tests:
   • start a container with python 3.11:

     $ docker container run \
         --detach \
         --name iot3 \
         --rm \
         -ti \
         --network host \
         -e http_proxy \
         -e https_proxy \
         -e no_proxy \
         --user $(id -u):$(id -u) \
         --mount type=bind,source=$(pwd),destination=$(pwd) \
         --workdir $(pwd) \
         python:3.11.9-slim-bookworm \
         /bin/bash -il

   • install the necessary packages:

     $ docker container exec -u 0:0 iot3 apt update
     $ docker container exec -u 0:0 iot3 apt install -y git

   • attach to the container:

     $ docker container attach iot3

3. start an MQTT client to dump messages (in another terminal):

   $ mosquitto_sub -h test.mosquitto.org -p 1883 -V mqttv5 -t "default/inQueue/v2x/#" -F %J |jq -C .

---

How to test:

1. Create and activate a virtual-env to run the tests:

   [python-3.11] $ python3.11 -m venv /tmp/iot3
   [python-3.11] $ . /tmp/iot3/bin/activate
   

2. Install the IoT3 SDK:

   [python-3.11] $ pip install python/iot3

3. Run the IoT3 Mobility SDK test-suite:

   [python-3.11] $ ./python/iot3/tests/test-iot3-mobility-gnss
   [python-3.11] $ ./python/iot3/tests/test-iot3-mobility-message
   [python-3.11] $ ./python/iot3/tests/test-iot3-mobility

---

Expected results:

1. A python venv is created and activated
2. The IoT3 SDK is isntalled succesfully
3. The tests succeed:
   • ./python/iot3/tests/test-iot3-mobility-gnss

     Basic, empty GNSS report...
     Disallow explicit timestamp...
     Validity range...
     Conflicting attributes...
     Attribute degree -> radian conversion...
     Attribute radian -> degree conversion...
     gpsd connection to 127.0.0.1:2947...
     

   • ./python/iot3/tests/test-iot3-mobility-message

     CAM with nothing available...
     CAM with latitude and longitude...
     CAM serialisation...
     CAM de-serialisation...
     DENM with nothing set...
     DENM with latitude, longitude, and cause...
     DENM continuation (update)...
     DENM continuation (termination)...
     DENM serialisation...
     DENM de-serialisation...
     Invalid generic message...
     De-serialisation of unrecognised message...
     De-serialisation of broken message...
     

   • ./python/iot3/tests/test-iot3-mobility

     Starting IoT3 Mobility SDK...
     Sending position...
     Sending alert 'accident'...
     Sending alert 'trafficCondition' as if relayed by an IQM...
     alert: (lat 43.635211999999996, lon 1.3745619999999998): trafficCondition
     

     Note that the accident alert is not reported, while the trafficCondition
     one is; the MQTT client reports two messages: 1 CAM, and 1 DENM for the
     accident alert:

     {
       "tst": "2024-11-19T15:36:14.214301Z+0100",
       "topic": "default/inQueue/v2x/cam/1234/1/2/0/2/2/2/0/2/1/3/3/3/1/0/3/0/0/0/3/3/1/2",
       "qos": 0,
       "retain": 0,
       "payloadlen": 520,
       "properties": {
         "user-properties": {
           "traceparent": "00-0acd4c56355b35d4b743d235de2783fe-46ba88bfbc33dda6-00"
         }
       },
       "payload": {
         "type": "cam",
         "origin": "self",
         "version": "1.1.3",
         "source_uuid": "1234",
         "timestamp": 1732026974008,
         "message": {
           "protocol_version": 1,
           "station_id": 240743,
           "generation_delta_time": 34616,
           "basic_container": {
             "station_type": 0,
             "reference_position": {
               "latitude": 436352120,
               "longitude": 13745620,
               "altitude": 800001
             },
             "confidence": {
               "position_confidence_ellipse": {
                 "semi_major_confidence": 4095,
                 "semi_minor_confidence": 4095,
                 "semi_major_orientation": 0
               }
             }
           },
           "high_frequency_container": {
             "heading": 3601,
             "speed": 16383,
             "longitudinal_acceleration": 161
           }
         }
       }
     }
     {
       "tst": "2024-11-19T15:36:15.034743Z+0100",
       "topic": "default/inQueue/v2x/denm/1234/1/2/0/2/2/2/0/2/1/3/3/3/1/0/3/0/0/0/3/3/1/2",
       "qos": 0,
       "retain": 0,
       "payloadlen": 428,
       "properties": {
         "user-properties": {
           "traceparent": "00-09ad8a11a1ac5954f532b8886c5e1c1b-c36f73e3c070d139-00"
         }
       },
       "payload": {
         "type": "denm",
         "origin": "self",
         "version": "1.1.3",
         "source_uuid": "1234",
         "timestamp": 1732026975010,
         "message": {
           "protocol_version": 1,
           "station_id": 240743,
           "management_container": {
             "action_id": {
               "originating_station_id": 240743,
               "sequence_number": 0
             },
             "detection_time": 659111775010,
             "reference_time": 659111775010,
             "event_position": {
               "latitude": 436352120,
               "longitude": 13745620,
               "altitude": 800001
             }
           },
           "situation_container": {
             "event_type": {
               "cause": 2
             }
           }
         }
       }
     }