Configuration Scan Only Finds One Device at a Time

[FTC8369]

My configuration scans will find my devices (motor, servo controllers), but only one at a time. We're spending a lot of time trying to fix this problem, and robot design is taking a back seat to tech problems. We don't feel like we can design a robot if we can only get two motors to function at a time. Is/has anyone else experienced this problem?

Team 8369

[5294-jjkd]

What phone model?
What android software version is running on the phone?

There are a few prior threads:

http://ftcforum.usfirst.org/showthread.php?6804-Motorola-G2-phones-scan-only-finds-one-controller-at-a-time&highlight=marshmallow

http://ftcforum.usfirst.org/showthread.php?5180-Can-t-downgrade-Moto-G-to-KitKat

[rupello]

My configuration scans will find my devices (motor, servo controllers), but only one at a time. We're spending a lot of time trying to fix this problem, and robot design is taking a back seat to tech problems. We don't feel like we can design a robot if we can only get two motors to function at a time. Is/has anyone else experienced this problem?

Team 8369

Have you tried the core discovery app from Modern Robotics?

http://www.modernroboticsinc.com/coredevicediscovery

We found this very helpful last year when trying to uncover module discovery issues.

[4634 Programmer]

My configuration scans will find my devices (motor, servo controllers), but only one at a time. We're spending a lot of time trying to fix this problem, and robot design is taking a back seat to tech problems. We don't feel like we can design a robot if we can only get two motors to function at a time. Is/has anyone else experienced this problem?

Team 8369

If your Android device is running Lollipop, then that's a known bug.

[FTC5110]

Moto G2 phones running Lollipop (5.1.x?) had a patch for USB device enumeration issues. For the most part Android users only plug in a single USB device but it's still a pretty significant bug that made it into production, and stuck for a few versions too, when you consider how big the developer resources were.
Down at the bottom of the planet we're not using Android phones for control and you could use something else too during development but of course would need to port back to Android for your competitions however time saved would probably still make it worthwhile.