1.使用 SDK 中的协议栈函数 gap_start_conn(&mac_addr,0,6, 6, 0, 400) 函数无法连接上制定 MAC 地址的从机。

2. gap_start_conn 函数没有返回值，调用该函数也没有报错 和 LOG 信息输出，如何找出 连接不上从机的原因。

我这里也是，使用 JLINK 可以正常的去下载代码，但是 使用 DEBUG 仿真 就跑不起来。

• JLink Info: Reset: Halt core after reset via DEMCR.VC_CORERESET.
• JLink Info: Reset: Reset device via AIRCR.SYSRESETREQ.
  **JLink Warning: CPU could not be halted
  ***JLink Error: Can not read register 15 (R15) while CPU is running
  ***JLink Error: Can not read register 16 (XPSR) while CPU is running
  ***JLink Error: Can not read register 0 (R0) while CPU is running
  ***JLink Error: Can not read register 1 (R1) while CPU is running
  ***JLink Error: Can not read register 2 (R2) while CPU is running
  ***JLink Error: Can not read register 3 (R3) while CPU is running
  ***JLink Error: Can not read register 4 (R4) while CPU is running
  ***JLink Error: Can not read register 5 (R5) while CPU is running
  ***JLink Error: Can not read register 6 (R6) while CPU is running

@thegavin 在 有没有1主多从的蓝牙方案推荐? 中说：

，最多5个TX间组

蓝牙里的RSSI信号强度值，无法准确反映Tx Rx的 距离。

• 需要自己去修改广播内容，修改服务uuid 那一项。

• 因为在广播包中有个字段声明了自己是 HID 设备，所以手机扫描到后是键鼠的图标。

• 代码如下

void at_init_advertising_parameter(void)
{

uint8_t *pos;
uint8_t adv_data[0x1C];
uint8_t adv_data_len = 0;

pos = &adv_data[0];
uint8_t manufacturer_value[] = {0x00,0x00};
*pos++ = sizeof(manufacturer_value) + 1;
*pos++  = '\xff';
memcpy(pos, manufacturer_value, sizeof(manufacturer_value));
pos += sizeof(manufacturer_value);

uint16_t uuid_value = 0xFF03  ;  // 将 HID_SERV_UUID 改成你想设置的 任意 2字节 UUID
*pos++ = sizeof(uuid_value) + 1;
*pos++  = '\x03';
memcpy(pos, (uint8_t *)&uuid_value, sizeof(uuid_value));
pos += sizeof(uuid_value);
adv_data_len = ((uint32_t)pos - (uint32_t)(&adv_data[0]));

gap_adv_param_t adv_param;
adv_param.adv_mode = GAP_ADV_MODE_UNDIRECT;
adv_param.adv_addr_type = GAP_ADDR_TYPE_PUBLIC;
adv_param.adv_chnl_map = GAP_ADV_CHAN_ALL;
adv_param.adv_filt_policy = GAP_ADV_ALLOW_SCAN_ANY_CON_ANY;
adv_param.adv_intv_min = adv_int_arr[gAT_buff_env.default_info.adv_int];
adv_param.adv_intv_max = adv_int_arr[gAT_buff_env.default_info.adv_int];
gap_set_advertising_param(&adv_param);
gAT_ctrl_env.curr_adv_int = adv_param.adv_intv_min;

gap_set_advertising_data(adv_data,adv_data_len);
at_init_adv_rsp_parameter();

}

SDK中实现了 OTA profile，但是对应 主机 APP 需要自己去开发吗？是否有官方的 APP可以使用