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problems with gatt package on Nanopi Neo Air

Moderators: chensy, FATechsupport

after installing gatt package on my Nanopi NEO Air, and compiling the discoverer.go example, when i try to run it, i get the following error:

2017/12/01 14:25:27 dev: hci0 up
2017/12/01 14:25:27 dev: hci0 down
2017/12/01 14:25:27 dev: hci0 can't bind to hci user channel, err: invalid argument.
2017/12/01 14:25:27 dev: hci0 opened
State: PoweredOn

... and no peripheral devices are detected. could anyone tell me which is the problem?. i', sure hci0 is down before runnng discoverer example. i'm running friendlycore-xenial_3.4.39_20171102. thanks
Nice info !

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