How to use multiple radios

[phillips0616]

Hello, I am having difficulties using multiple radio dongles and I wanted to make sure I wasn't missing any obvious configuration steps.

I am attempting to fly 4 crazyflies, 2 on each channel. I've configured the crazyflies in the cfclient to set their communication channels like in the screenshot below (I configured two to use channel 80 and two channel 90). I then updated the crazyflie.yaml file to use the appropriate channel for each crazyflie.

However, when I launch hover_swarm.launch only the drones on one of the channels connect (the leds for 2 turn green and 2 remain red). I can change which drones connect by switching the USB port the radios are plugged into, or by switching the order of the radios when plugged into a USB hub, but it is always only one channel working. Below is a screenshot of the output from hover_swarm.launch (in this example I am only using two drones, one on each channel).

Is there something obvious I am missing here, or do you have any troubleshooting suggestions?