#Coding4Fun – How to control your #drone with 20 lines of code! (3/N)

Buy Me A Coffee

Hi!

Today I’ll write the equivalent of a Hello World in the drone ecosystem. This is a very complex app which:

  • take off the drone
  • wait a couple of seconds
  • lands the drone

I’ve followed the Python code sample from the SDK and the final code is very complex (see below). And it deserves some remarks

  • Line 11. The function recv() run in a separated thread to receive messages from the drone. The thread is started on line 44
  • Line 19. The function sendMessage() sends messages to the drone. Important, the messages must be UTF-8 encoded. This took me some time, until I figure it out. This time implements a timeout with 5 second until the response is processed in a separated thread
  • Lines 31-41. Connection information and sockets to communicate with the drone
  • Line 48. Main code for the app. Start the SDK mode, Wait 5 seconds, send the take off message, and then send the land message. A very simple exception catch is implemented here.

Important: When using the SDK, the 1st command should be “command”, as I did in line 49.

Here is the code:

Here is the app running at 3X speed so you don’t spend all day watching boring drones videos:

Drone Hello World, take off and land

Happy coding!

Greetings

El Bruno

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