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Problem with long topic string #262
I am trying to use pubsubclient for an MQTT subscriber for devicehub.net using an ESP32 device.
I ran into a lot of problems with seemingly simple code. After many trial and error, I found that if the topic string is too long (longer 109 characters), the client will not work. By that, I meant the callbacks will not be called for new messages to that topic. With devicehub.net, it is quite easy to get such long string. For example,
I am not sure if the problem is specific to ESP32 or not. I hope the problem will get fixed soon.