[tello_platform] Launch parameters

[pariaspe]

• Tello host and ports
• Tello internal state rate
• Tello internal sendCommand rate (TEMPORAL)
• Camera rate
• Camera on/off

[mhl787156]

Hi Guys - Just working on this one and doing some real tello tests, a couple questions?

• What are you referring to for sendCommand rate?
• For Camera on/off I have added extra functions videoStreamStart(...), videoStreamStop() to the Tello class. Is there a specific way you want to trigger on/off within the Tello_Platform_Node relating to the as2 sensor interfaces?

Will raise PR when tested, but changes for reference are here: https://github.com/ucl-delta/as2_platform_tello/tree/tello-launch-params

Thanks!