The use of the ESP8266 in the world of IoT

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By t0m
#82396 This is my first post and I searched for a solution without results.

I'm working with an esp8266 NodeMCU as a scale and connect it via WiFiClient to my could with pubsubclient as MQTT client. When I connect the ESP to an normal WiFi Router everything works like a charm. When I connect the ESP to my company WiFi, where you need to work with a proxy, I can't off course establish the connection via MQTT anymore.

Is there a way to work with a proxy in my setup? I don't even know where to deal with that. Either within the WiFiClient or during establishing the MQTT connection? I can't find any start point to deal with my problem and I'm pretty helpless. So any hint is welcome.

Proxy is IP + Port like