Im trying to receive mqtt data and write this to software serial to communicate with the serial connection on my spapool from a nodemcu but am having issues with this conversion. void onConnectionEstablished() { client.subscribe("/spanet/serialdata/rx", [] (const String &payload) { Serial.p…

[image] shanekuz: swSer.write(payload); use swSer.write(payload.c_str()); https://www.cplusplus.com/reference/string/string/c_str/

Const String to String issues

gfvalvo October 27, 2021, 10:48am 13

I don't believe any of it. Not without seeing the full code. Software Serial inherits from Print. It knows how to print/println a 'const String' .

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