How to send write command when doing BlueZ qualification test with SIG PTS tool

["Zhang, Ming" <Ming.Zhang@xxxxxxxxx>]

Hello BlueZ devs, 

I am doing BlueZ 5.43 qualification test with SIG PTS tool. When testing the cases like GATT/CL/GAW/BV-03-C: 
PTS tool pops up a message, see attached, asking to send a write request from my IUT to PTS. 

I am trying to use the “write” command in bluetoothctl to send the write request, but nothing works. How to send write request here? 

Thanks, 
- Ming

Attachment: GATT-CL-GAW-BV-01-C send write request.png
Description: GATT-CL-GAW-BV-01-C send write request.png