请大佬帮忙看一下sim800c模块连接onenet的问题

[E/at.skt.sim800] sim0 device socket(0) wait send result timeout.
[E/mqtt] [887246] send ping rc: -1
[D/onenet.mqtt] Enter mqtt_offline_callback!
[D/mqtt] restart!
[D/onenet.mqtt] Enter mqtt_connect_callback!
[D/mqtt] ipv4 address port: 1883
[D/mqtt] HOST = 'mqtts.heclouds.com'
[I/mqtt] MQTT server connect success.
[I/mqtt] Subscribe #0 $sys/省略/省略/thing/service/+/invoke OK!
[D/onenet.mqtt] Enter mqtt_online_callback!