Why "bt_nus_client_send" will return -120?

[Leo Mo]

I use bt_nus_client_send to send data, but it return -120.

#define EALREADY 120    /* Socket already connected */

I can't understand.

[Hieu]

Hello Leo,

This issue is discussed in this case:  bt_nus_client_send failed (err -120) happend in certain frequency .

Could you please check that out and see if the information there helps?

Hieu