- rewrite dbusx package so that methods either act on a particular bus or require a bus passed as a parameter
- don't store D-Bus in context
- define a D-Bus API which stores bus connections which can be retrieved by other functions
- rework the linux controller to store the D-Bus api and pass to sensor/MQTT workers
- rework the linux controller so it can satisfy the agent's SensorWorker and MQTTWorker interfaces
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