ESP-Jumpstart例程中第5个工程：5_cloud连接报错！

[zhuwenjun]

IDF版本：esp-idf-v4.4.4
配网成功后，连不上云，报错信息如下：

Starting cloud
I (64403) cloud: Shadow Init
I (64413) cloud: Connecting to AWS...
I (67543) NimBLE: GAP procedure initiated: stop advertising.

I (67573) NimBLE: GAP procedure initiated: stop advertising.

I (67583) NimBLE: GAP procedure initiated: terminate connection; conn_handle=0 hci_reason=19

E (67663) protocomm_nimble: Error setting advertisement data; rc = 30
I (67753) wifi_prov_mgr: Provisioning stopped
I (67753) wifi_prov_scheme_ble: BTDM memory released
E (71433) aws_iot: failed! mbedtls_net_connect returned -0x52
:8883433) cloud: Error(-23) connecting to a3orti3lw2padm-ats.iot.us-east-1.amazonaws.com

请问各大神是什么原因？

[ESP_YJM]

mbedtls_net_connect 返回 0x52 表示 MBEDTLS_ERR_NET_UNKNOWN_HOST，意思是 DNS 解析失败，你可以打开 DNS 日志（LWIP 里 DNS_DEBUG）看下，是否可以解析成功。