Can't write characteristic value

Hi Dialog
I add two charactristics in custom profile service(refer to sample128), and I can read the value by use a android phone.
But I fail to write the characteristic value in the service.What's the problem?
It seems that I can't receivce the msg(GATTC_WRITE_CMD_IND).Is there anything wrong in my code?

static int gattc_write_cmd_ind_handler(ke_msg_id_t const msgid,
struct gattc_write_cmd_ind const *param,
ke_task_id_t const dest_id,
ke_task_id_t const src_id)
{
uint8_t char_code = SAMPLE128_ERR_CHAR;
uint8_t status = PRF_APP_ERROR;

if (KE_IDX_GET(src_id) == simpleKey_env.con_info.conidx)
{
if(param->handle == simpleKey_env.sample128_shdl + SIMPLE_KEY_VAL1)
{
char_code = SIMPLE_KEY_VAL1;
}
else if(param->handle == simpleKey_env.sample128_shdl + SIMPLE_KEY_CFG2)
{
char_code = SIMPLE_KEY_CFG2;
}

switch(char_code)
{
case SIMPLE_KEY_VAL1:
attmdb_att_set_value(param->handle,
sizeof(uint8_t),
(uint8_t *)¶m->value[0]);
if(param->last)
{
sample128_send_val(param->value[0]);
}
status = PRF_ERR_OK;
break;

case SIMPLE_KEY_CFG2:
uint16_t ntf_cfg;
ntf_cfg = co_read16p(¶m->value[0]);
if ((ntf_cfg == PRF_CLI_STOP_NTFIND) || (ntf_cfg == PRF_CLI_START_NTF))
{
attmdb_att_set_value(param->handle, sizeof(uint16_t), (uint8_t *)¶m->value[0]);
if (ntf_cfg == PRF_CLI_START_NTF)
{
simpleKey_env.feature |= PRF_CLI_START_NTF;
}
else
{
simpleKey_env.feature &= ~PRF_CLI_START_NTF;
}
status = PRF_ERR_OK;
}
break;
default:break;
}
}
atts_write_rsp_send(simpleKey_env.con_info.conidx, param->handle, PRF_ERR_OK);
return (KE_MSG_CONSUMED);
}