A high-performance, high-stability, cross-platform MQTT client, developed based on the socket API, can be used on embedded devices (FreeRTOS / LiteOS / RT-Thread / TencentOS tiny), Linux, Windows, Mac, with a very concise The API interface realizes the quality of service of QOS2 with very few resources, and seamlessly connects the mbedtls encryption library.
mqtt+RT-Thread SAL 嵌套字+sim7600进行demo尝试。 刚开始mqtt_connet就没有成功，所以重新配置客户端的host和port使客户端使用新的broker进程连接，但是 重新连接时仍旧失败，提示如下： [E/at.clnt] execute command (AT+CIPCLOSE=0) failed! [E/at.clnt] execute command (AT+CIPOPEN=0,"TCP","xxx.xxx.xxx.xxx",xxxx) failed! [E/at.clnt] execute command (AT+CIPCLOSE=0) failed! [E/at.clnt] execute command (AT+CIPCLOSE=0) failed!