Rust sdk

[nbuffon]

What's new

Python workflows are failing since PR #143 was merge in master; only the rust project is modified in this PR

• Add json_counter example to illustrate how to use mqtt mod
• Use test.mosquitto.org as public MQTT broker in the example configuration file
• Allow to add publish properties in MQTT messages

Closes #125

mobility

• Fix geo_topic failing unit test
• New feature mobility for mobility related structs and methods
• Restrict mobility related structs and methods to mobility feature

telemetry

• New feature telemetry for telemetry related structs and methods
• Add telemetry methods (OpenTelemetry) (closes Send messages to telemetry service service from application for MQTT exchanges #124)
• Add telemetry example to illustrate how to use telemetry mod
• Implement Injector and Extractor traits for Packet to set W3C context as MQTT publish property

How to test

1. Launch json_counter example

   cargo run --example json_counter
   

   Example runs and yields about the number of JSON messages received among the total

   Received 1000 messages including 997 as JSON
   Received 2000 messages including 1997 as JSON
   Received 3000 messages including 2997 as JSON
   ...

2. Configure OTLP collector
   Edit the example/config.ini file to set the OTLP collector endpoint config by filling the following section

   [telemetry]
   host="otlp.domain.ext"
   port=4318
   ; Optionnal, defaults to "v1/traces"
   path="custom/v1/traces"
   

3. Launch telemetry example

   cargo run --example telemetry --features telemetry
   

   Example runs and sends 4 traces

   Transport: standard MQTT; TLS disabled
   INFO [telemetry] logger ready on log
   INFO [telemetry] Send a trace with a single span 'ping' root span
   INFO [telemetry] └─ Ping                  trace_id: 4d9183d7274f4b8c850d46887f35141a, span_id: bd458664e66f860e
   DEBUG [reqwest::connect] starting new connection: http://90.84.47.115:18000/
   INFO [telemetry] Send a trace with a single span 'pong' root span linked with the previous one 'ping'
   INFO [telemetry] └─ Pong                  trace_id: 8479671f21bf9b0fd166b8ead1ff2761, span_id: 3c153c5e70a8a2a2
   INFO [telemetry] Send a single trace with two spans
   INFO [telemetry] └─ Root                  trace_id: cd4a1ee42952fcafc5eaf61f1881eca2, span_id: 7580f10ca1595e5b
   INFO [telemetry]    └─ Child              trace_id: cd4a1ee42952fcafc5eaf61f1881eca2, span_id: d570aff4e9889e95
   INFO [telemetry] Send a trace with 3 spans from 3 threads
   INFO [telemetry] └─ Main thread           trace_id: 6b1fe1d4b7aa574bbbe4b987053bcfd2, span_id: e5050064d17d0527
   INFO [telemetry]    ├─ Sender thread      trace_id: 6b1fe1d4b7aa574bbbe4b987053bcfd2, span_id: 9f449076f02efdd6
   INFO [telemetry]    └─ Listener thread    trace_id: 6b1fe1d4b7aa574bbbe4b987053bcfd2, span_id: d1bb7d93ec83207e
   

4. Launch copycat example

   cargo run --example copycat --features geo_routing