我的esp8266显示的串口内容MQTT一直连接，时不时设备就掉线了

q1127957008

[586659] Retrying MQTT connection in 5 seconds...
[591659] Connecting to MQTT...
[597838] MQTT Connected!
[597838] Freeheap: 5040
[613221] Connecting to MQTT...
[615210] MQTT Connected!
[615210] Freeheap: 4656
[645222] MQTT Ping!
[675876] MQTT Ping!
[706513] MQTT Ping!
[737107] MQTT Ping!
[738679] Connecting to MQTT...
[755284] Connection failed
[755284] Retrying MQTT connection in 5 seconds...
[760284] Connecting to MQTT...
[763553] MQTT Connected!
[763553] Freeheap: 6528
[793563] MQTT Ping!
[794996] Connecting to MQTT...
[808241] Connection failed
[808241] Retrying MQTT connection in 5 seconds...
[813241] Connecting to MQTT...
[817493] Failed to subscribe
[817493] Retrying MQTT connection in 5 seconds...
[847509] MQTT Ping!
[848937] Connecting to MQTT...
[853328] Failed to subscribe
[853328] Retrying MQTT connection in 5 seconds...
[883348] MQTT Ping!
[913915] MQTT Ping!
[944508] MQTT Ping!
[945940] Connecting to MQTT...
[949475] MQTT Connected!
[949475] Freeheap: 9064
[979478] MQTT Ping!
[1010054] MQTT Ping!
[1011485] Connecting to MQTT...
[1032235] Connection failed
[1032235] Retrying MQTT connection in 5 seconds...
[1037235] Connecting to MQTT...
[1060056] Connection failed
[1060056] Retrying MQTT connection in 5 seconds...
[1065056] Connecting to MQTT...
[1081363] Connection failed
[1081363] Retrying MQTT connection in 5 seconds...
[1086363] Connecting to MQTT...
[1097415] Connection failed
[1097415] Retrying MQTT connection in 5 seconds...
[1102415] Connecting to MQTT...
[1123162] MQTT Connected!
[1123162] Freeheap: 9064
[1153169] MQTT Ping!

奈何col

可能是您的程序触发了broker限制（比如发送频率过高）
测试下例程