ahoy / Open DTU

Download esptoo
https://github.com/espressif/esptool/releases

#pip install esptool
#git clone git@github.com:marcelstoer/nodemcu-pyflasher.git
#git clone https://github.com/espressif/esptool.git /tmp/esptool

wget https://github.com/espressif/esptool/releases/download/v4.7.0/esptool-v4.7.0-linux-amd64.zip -q -O /tmp/esptool.zip
unzip /tmp/esptool.zip -d /tmp
chmod +x /tmp/esptool-linux-amd64/esptool

Download ahoy firmware
https://github.com/lumapu/ahoy/releases
https://fw.ahoydtu.de/fw/release/

# dev
#URL=https://nightly.link/lumapu/ahoy/workflows/compile_development/development03/ahoydtu_dev.zip

# stable
AHOY_RELEASE=0.8.156
URL=https://github.com/lumapu/ahoy/releases/download/ahoy_v${AHOY_RELEASE}/ahoy_v${AHOY_RELEASE}.zip

wget ${URL} -q -O /tmp/ahoydtu.zip

# extract
unzip /tmp/ahoydtu.zip -d /tmp

Flash Ahoy DTU

# get chip id
sudo  /tmp/esptool-linux-amd64/esptool   --port /dev/ttyUSB0   --baud 115200  chip_id | grep "Chip is"

# Flash firmware
# ESP8266 (Wemos D1 Mini / ESP8266EX)
AHOY_FW=/tmp/ESP8266/2*_esp8266-minimal.bin
# ESP32 (ESP32 WROOM32)
AHOY_FW=/tmp/ESP32/*_esp32-wroom32.bin
# opendtu-generic_esp32.factory.bin

sudo chmod 777  /dev/ttyUSB0

eval /tmp/esptool-linux-amd64/esptool \
  --port /dev/ttyUSB0 \
  --baud 115200 \
  --after hard_reset \
  write_flash \
  --flash_size detect \
  --flash_mode dio \
  --erase-all \
  0x00000 \
  "${AHOY_FW}"

# ESP32 (ESP32 WROOM32)
#/tmp/esptool/esptool.py --port /dev/ttyUSB0 --chip esp32 --before default_reset --after hard_reset   write_flash --flash_mode dout --flash_freq 40m --flash_size detect   0x1000 bootloader.bin   0x8000 partitions.bin   0x10000 230927_ahoy_0.7.60_963e618_esp32.bin


# esptool.py --port /dev/ttyUSB0 --chip esp32 --before default_reset --after hard_reset \
  write_flash --flash_mode dout --flash_freq 40m --flash_size detect \
  0x0 opendtu-generic*.factory.bin

Wiring ESP8266

Image copyright:AhoyDTU.de

ESP32 / ESP8266

ESP32
https://docs.espressif.com/projects/esp-dev-kits/en/latest/esp32/esp32-devkitc/user_guide.html

ESP8266
https://esphome.io/components/esp8266/
https://lastminuteengineers.com/esp8266-pinout-reference/
https://lastminuteengineers.com/wemos-d1-mini-pinout-reference/

ESPHome
https://esphome.io/guides/installing_esphome/
https://esphome.io/components/wifi/#configuration-variables

sudo apt install -y python3.14-venv
python3 -m venv venv
source ~/venv/bin/activate

pip install esphome -U

Modbus

sudo usermod -a -G dialout $USER
# login

# flash over USB
esphome run sinilink-modbus.yaml  --device /dev/ttyUSB0

# flash over network
esphome run sinilink-modbus.yaml --device  192.168.178.23

Backup / read flash

esptool --chip esp8266 --port /dev/ttyUSB0 read_flash 0x00000 0x400000 firmware_dmp.bin

Restore / write flash

esptool.py --chip esp8266 --port /dev/ttyUSB0 write_flash 0x000000 firmware_dmp.bin
esp32