I have updated the module, FSC-BT826E which support HID+SPP+BLE.
And It seems that now it stay pressed, before it was doing flashes, Do we need to use any additional command to release the keys?
Please refer below step:
1. If you want send ''a'', for ''press'' please send ''AT+HIDSEND=2,\x00\x04''
for ''release'' is'' please send ''AT+HIDSEND=2,\x00\x00''.
2.Then we can send ''AT+HIDMODE=100''.
3.Then ''press+release'', we can send ''AT+HIDSEND=4,\x00\x04\x00\x00''.
For more details
http://www.feasycom.net/bluetooth-module/bt-module-hc-05-bluetooth-module.html