Enable/Disable RTK Service

[msclissa]

When using a GQ7 + RTK solution with SensorCloud Premium or other networked RTK source the easiest way to stop receiving RTK corrections (and prevent charges) is to disable RTK (NMEA output) on the GQ7. Useful for when a robot is not moving, additional corrections are not needed.

Requested service: enable/disable RTK (mscl::InertialNode::enableRtk(bool)), potentially service to check if enabled (mscl::InertialNode::rtkEnabled()) but that seems less valuable.

Note: if using a non-networked NTRIP caster (NMEA not required for corrections), disabling RTK on the GQ7 will not stop corrections being sent to the RTK device. At this time there is no way to programmatically close this type of connection without turning off the RTK device.