gatt error doing buttonless dfu

[james cho]

HELLO

I have trouble connecting dfutarg i am doing this

in doing this tutorial I skipped 5,6,7 in step1

and i coudn't do 5,6,7 in step3 because of not connection

here is nrfconnect log

i searched this problem and tried tofix but i can't solve it

someone said they connected at least once but in my case i never connected dfutarg

my phone is LGV20 and version is oreo(android8)

and i want to know how to use sniffer for debuging tell me what i can refer to

[Hung Bui]

Hi James, 

I would suggest to try testing with the bootloader first before testing with the buttonless.

Could you try to follow my guide here and let me know if it works ? 

GATT 133 has been an issue with Android for a long time. But we haven't seen this issue on recent phones . Please make sure you delete bonding on the phone and try turn off and on Bluetooth before testing. 

You can try capturing a sniffer trace  if you have a nRF52 DK , please follow the documentation of the sniffer.