潘多拉（STM32L475VE）开发板的rtthread的MQTT例子无法正常运行问题问题，

H3Se

麻烦各位大佬帮忙解说下，小弟自学MQTT刚开始，然后在env上直接使用mqtt例子，开发板上的模块是使用esp8266的，开发板上是能够连上NTP校正RTC时间数据的，可是唯独在使用MQTT_STAR命令时,就会出现无法连接。我把串口接收到信息看过后，不知道从哪下手，串口信息我发出来 \ | /
- RT -     Thread Operating System
/ | \     4.0.2 build Apr  6 2022
2006 - 2019 Copyright by rt-thread team
lwIP-2.0.2 initialized!
[I/I2C] I2C bus [i2c3] registered
[I/I2C] I2C bus [i2c4] registered
[I/drv.rtc] RTC hasn't been configured, please use <date> command to config.
[D/drv.qspi] qspi init success!
[SFUD] Find a Winbond flash chip. Size is 16777216 bytes.
[SFUD] W25Q128 flash device is initialize success.
[D/drv.qspi] qspi init success!
[I/sal.skt] Socket Abstraction Layer initialize success.
[I/sensor] rt_sensor init success
[I/sensor] rt_sensor init success
[I/at.clnt] AT client(V1.3.0) on device uart2 initialize success.
[D/at.dev.esp] network interface device(esp0) set up status
[D/at.dev.esp] esp0 device initialize start.
msh />[I/app.card] sd card mount to '/'
[I/at.dev.esp] esp0 device wifi is connected.
[D/at.dev.esp] AT version:1.7.0.0(Aug 16 2018 00:57:04)

[D/at.dev.esp] SDK version:3.0.0(e27cf60)

[D/at.dev.esp] compile time:Oct 30 2018 18:18:34

[I/at.dev.esp] esp0 device wifi is connected.
[I/at.dev.esp] esp0 device network initialize successfully.
[I/ntp] Get local time from NTP server: Wed Apr  6 08:27:18 2022


mqtt_start
[D/mqtt.sample] inter mqtt_connect_callback!
[D/mqtt] ipv4 address port: 1883
[D/mqtt] HOST = 'iot.eclipse.org'
msh />
msh />
[E/at.clnt] execute command (AT+CIPSTART=0,"TCP","198.41.30.254",1883,60) failed!
[D/at.skt.esp] esp0 device socket (0) connect failed, the socket was not be closed and now will connect retry.
[E/at.clnt] execute command (AT+CIPCLOSE=0) failed!
[E/mqtt] connect err!
[E/mqtt] Net connect error(-2).
[D/mqtt.sample] inter mqtt_offline_callback!
[D/mqtt] restart!
（以下的一段就是不断重复发送的内容）
[D/mqtt.sample] inter mqtt_connect_callback!
[D/mqtt] ipv4 address port: 1883
[D/mqtt] HOST = 'iot.eclipse.org'
[E/at.clnt] execute command (AT+CIPSTART=0,"TCP","198.41.30.254",1883,60) failed!
[D/at.skt.esp] esp0 device socket (0) connect failed, the socket was not be closed and now will connect retry.
[E/at.clnt] execute command (AT+CIPCLOSE=0) failed!
[E/mqtt] connect err!
[E/mqtt] Net connect error(-2).
[D/mqtt.sample] inter mqtt_offline_callback!
[D/mqtt] restart!