EnviroDIY

2023-06-29 at 6:38 PM #17958

Participant

Thanks for the explanation – I do so appreciate that the code at 9600 baud works, and there is a lot of hard work gone into configuring it – as you say to work both first off and subsequ

Thanks for the explanation – I do so appreciate that the code at 9600 baud works, and there is a lot of hard work gone into configuring it – as you say to work both first off and subsequent power ups.

Coming from a real time programming background I keep forgetting about the simplicity of Arduino. So I keep tripping over issues like this – it will be burnt into my brain someday – it would have been so nice for that explanation to be in place in the code where it goes through gyrations.

I would suggest its actually the architecture that is the real issue, not the lack of cycles which consume power just polling . I’ve used mega2560 with 115200 fast processing in the past.

https://forum.arduino.cc/t/serial-input-basics/278284

and from TinyGsmClientESP8266.h

      while (stream.available() > 0) {
        TINY_GSM_YIELD();
        int8_t a = stream.read();
        if (a <= 0) continue;  // Skip 0x00 bytes, just in case
        data += static_cast<char>(a);

while (stream.available() > 0) {

TINY_GSM_YIELD();

int8_t a = stream.read();

if (a <= 0) continue; // Skip 0x00 bytes, just in case

data += static_cast<char>(a);

it needs to receive <NL> before processing the buffer.

My take is the issue is that the buffer handling/parsing is being processed at too high level – and not closer to the hardware. There is a lot of value in reducing power consumption in being able to process the serial stream to/from the MMW faster – so I believe its worth understanding. However I haven’t gone through the layers with TinGSM to understand it.

Some years ago while chatting with a Standford CSU Professor at a TinyOS conference, he said it was so hard to teach people real-time processing, and of course event based processing and finite state machines . Their solution, Berkley/Standford nesC (network embedded systems C) was harder to understand than the problem they where solving.

http://tinyos.stanford.edu/tinyos-wiki/index.php/Getting_Started_with_TinyOS#The_BlinkAppC.nc_Configuration

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