[esp8266 lua]mqtt.lua:19: attempt to index global 'mqtt' (a nil value)

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[esp8266 lua]mqtt.lua:19: attempt to index global 'mqtt' (a nil value)

1. mqtt.lua:19: attempt to index global 'mqtt' (a nil value)
   

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固件没有mqtt模块. 需要在固件生成页把mqtt选上再重新生成.