main.py does not run automatically

[bukaida]

I have started learning micropython today. I have successfully flashed my ESP8266 with latest stable micropython firmware, configured it with my router and was able to run webrepl.html with python prompt.
Now as I was following the tutorial https://docs.micropython.org/en/latest/ ... ystem.html I saw that there should be two automatic script boot.py and main.py. os.listdir() showed me there is only one boot.py. so I created one main.py containing a simple script

Code: Select all

import os
print(os.listdir())

when I press the reset button and reconnect to webrepl, nothing happens. However when I type ->

Code: Select all

import main

it runs and list the files. What am I missing? Also nothing happens if I download boot.py from device via webrepl, put these lines in it and reload it back.

I know this is very basic but pardon my ignorance as today is my "Hello World" day to Micropython.

I am on windows 10 pro but I guess that does not matter on a browser based interface.

[Christian Walther]

My guess is that it does run, but by the time you connect again, you have missed the output already. Try working with a serial connection (which, unlike WebREPL, isn’t disconnected at reset) or adding some delay into the script so you can catch it before it’s done.

[bukaida]

My project requires mobility. Can a serial connection be made with WiFi ? I am just beginning, so have no clear idea.

[Christian Walther]

No (unless you use some kind of external UART-to-WiFi bridge). So that leaves the second option (adding a delay). Or use something other than console output to check if your script runs, e.g. blink an LED or write to the filesystem.

[bukaida]

Is it possible to interface with the board directly via a python program running on command prompt? The connection should be WiFi.

[jimmo]

Yes, you can write a program on the micropython that receives commands over wifi from a host program running on your PC.

Here's a simple web server for MicroPython that comes with an example of controlling GPIO pins remotely. https://github.com/miguelgrinberg/microdot

For a more complete solution, maybe check out https://github.com/peterhinch/micropython-iot

[bukaida]

Yeah Peter himself is helping me out with that in another thread