HI here (sd_ble_gattc_characteristics_discover(conn_range); conn_range what parameter need to give... if suppose through UART I am sending data like AT command format means "AT+UBTGDCS=,

[0_velan_1]

https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.s140.api.v6.1.1%2Fgroup___b_l_e___g_a_t_t_c___c_h_a_r___d_i_s_c___m_s_c.html&cp=4_7_4_3_2_2_3_1

[Kenneth]

I think we need more information here. You are mentioning AT commands, but we don't have any AT commands to execute softdevice api. Maybe you are using module vendor that have created an AT commands? Then you need to contact the module vendor.

Kenneth