Thanks. Timing is very critical indeed for softserial. I have not seen any software serial work correct on 115K on any platform.(Uno, ESP8266, mega2560, ESP32 etc). Maybe only for sending. All is depending on how fast the code is working, the system is handling interrupts and the system load. Person...

Try this one https://github.com/paulvha/ESP32

it is based on the Jdollar library but it needed a large number of fixes before it worked. Make sure to read the readme!

The issue is clock-stretch as mentioned before. That is not implemented in the ESP32 with the Arduino IDE as it uses the hardware I2C. I run into the same problem with an SCD30 and could not get it to work. In order to overcome I have taken the I2C from the ESP8266 and made it work on an ESP32. It i...

I may have misunderstood and maybe still do..
I compiled a empty sketch and your sketch. I do see a difference in memory BUT in percentage it is a wash...

I am not from Expressif, but I am not surprised. Even if you do NOT include anything in a sketch, the compiler always includes a number of variables by default (e.g. from different default .h files). Some of these are needed for house-keeping ( pointers in memory, background task etc etc) Compile an...

A write() / print() will directly write in to the UART FIFO. No extra buffer. It will check whether there is place the FIFO, otherwise it will hold/wait until there is. Instead of using a hardwareserial, you could consider softwareserial. That will perform it's own bit-banging and does not wait for ...