Recommendations for multi-rotor tethers? (Preferably powered and retractable)

Can anyone point me in the right direction to purchase a modest tether system for multi-rotor aircraft (or instructions for building one) to aid in safely testing code while airborne?  I need a system that will eliminate the need for batteries (power

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Change Heartbeat Rate in qGroundControl?

Is there any way to change how often qGroundControl expects to receive a heartbeat message from the APM?

I saw this note in the Developer's Section, but I still don't see a setting in qGroundControl to change the expected Heartbeat rate.  

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