When flying more than 2 Sparks in close proximity, Wifi interference causes problems - like messages between the App and the drone can be dropped or the video stream can cut out.

To fix this you can change a Spark's Wifi channel programmatically with: setFrequency.  The documentation states that it does not support Spark however, it does work.  

And if you're ever in a bind and cant do this programmatically you can change the channel in DJI Go 4 > Settings > Wifi > Custom > Channel.  The setting will remain when you switch to your SDK application.  

~Chachi from the DJI Developer Support Team

When flying more than 2 Sparks in close proximity, Wifi interference causes problems - like messages between the App and the drone can be dropped or the video stream can cut out.

To fix this you can change a Spark's Wifi channel programmatically with: setFrequency.  The documentation states that it does not support Spark however, it does work.  

And if you're ever in a bind and cant do this programmatically you can change the channel in DJI Go 4 > Settings > Wifi > Custom > Channel.  The setting will remain when you switch to your SDK application.  

~Chachi from the DJI Developer Support Team