esp32modbusTestMicropython

Micropython for ESP32 TTGO T-Display with micropython FW. Testing examples with implementation of

ModBus library
ST7789 display library with romfonts
WiFi & WebSocket connection
threads

Used libraries

WebSockets: https://github.com/danni/uwebsockets
ST7789: https://github.com/russhughes/st7789py_mpy
Modbus: https://github.com/brainelectronics/micropython-modbus

Micropython FW

v1.19.1 - https://micropython.org/download/esp32/

Used tools

rshell: https://github.com/dhylands/rshell
esp-idf: https://github.com/espressif/esp-idf
esptool: https://github.com/espressif/esptool

First run / installations

connect ESP32 TTGO T-Display with USB to a PC
download Micropython FW (v1.19.1>)
erase flash on ESP32
- esptool.py --chip esp32 --port /dev/ttyACM0 erase_flash
upload new FW onto ESP32
- esptool.py --chip esp32 --port /dev/ttyACM0 --baud 460800 -z 0x1000 write_flash ./micropythonfw.bin
hard reset ESP32 board
via rshell connect to the ESP32
- rshell -p /dev/ttyACM0 -b 115200
board will mount after connecion it's flash disk into a /pyboard/ directory
upload files into that directory via cp ./files/* /pyboard/
after all files is uploaded you may hard reset the ESP32 board
type repl in rshell to see serial outpur
type python server.py to run websocket testing server

Usage

This testing App is just trying to make some performance observations. It will make two threads. One with rendering scanned WiFi networks on st7789 display. Second that will work with networking. Board is doing:

create two threads
create station WiFi
every 2.seconds scan WiFi networks
every 2.seconds create WebSocket client & connect to WebSocket server to send & recieve message
outputing debug messages into a USB serial
rendering scaned WiFi's to display
creating text file with R/W on flash storage
!!! implemented umodbus library BUT getting allocation memory fail error - TODO (need more work with used memory on ESP32 board)