Starts providering the devices.
This will cause DEVICE_ADDED and DEVICE_REMOVED messages to be posted on the provider's bus when devices are added or removed from the system.
Since the DeviceProvider is a singleton, start may already have been called by another user of the object, stop needs to be called the same number of times.
After this function has been called, get_devices will return the same objects that have been received from the DEVICE_ADDED messages and will no longer probe.
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