Serial latency? about arduino-robust-serial

[araffin]

Hello,
will try to answer a bit longer by this weekend.
In the past I used arduino mega mostly and I remember having ~1-10ms latency (but I'm not sure we checked it closely back then, that was more than 5 years ago ^^").

Using an arduino nano it takes me 15.5 ms to send and then receive 8 bytes from pyserial

so the problem is python?
if so, you might consider going to c++/rust or try to find faster implementation of Serial.read().
(the latency is from the python side, right?)

[Armandpl]

so the problem is python?

Looks like it's not as the latency varies depending on the arduino. e.g using the arduino nano every and the same code I get 1.5 ms instead of 15.5 ms.

try to find faster implementation of Serial.read()
On the arduino side? How would I go about finding this? any keyword I should search for?

[araffin]

You could also debug by mocking the arduino (maybe take a look at python serial tests: https://github.com/pyserial/pyserial/blob/master/test/handlers/protocol_test.py): https://github.com/balp/arduino-mock

Did you had a look at the low_latency_mode option?

See pyserial/pyserial#290

[Armandpl]

thanks very much I'm going to try that :)