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.gitignore

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+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/latest/usage/project/#working-with-version-control
+.pdm.toml
+.pdm-python
+.pdm-build/
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+.idea/

boot.py

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+# This file is executed on every boot (including wake-boot from deepsleep)
+#import esp
+#esp.osdebug(None)
+import gc
+import ujson
+import network
+from utime import sleep_ms
+from machine import Timer, Pin
+#webrepl.start()
+# Open and parse the config file
+with open("config.json", "r") as config_file:
+    config = ujson.load(config_file)
+
+
+remoteName = "Remote-"+config["remote-id"]
+
+ap_if = network.WLAN(network.AP_IF)
+ap_if.active(False)
+
+wlan = network.WLAN(network.STA_IF)
+wlan.active(True)
+wlan.config(dhcp_hostname=remoteName)
+
+# If not already connected
+if not wlan.isconnected():
+    # Scan for WiFi networks
+    networks = wlan.scan()
+    # Go trough all scanned WiFi networks
+    for network in networks:
+        # Extract the networks SSID
+        ssid = network[0].decode("utf-8")
+        # Check if the SSID is in the config file
+        if ssid in config["wifis"].keys():
+            # Start to connect to the pre-configured network
+            wlan.connect(ssid, config["wifis"][ssid])
+            break
+
+gc.collect()

config.json

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+{
+    "remote-id":"xxxxxx",
+    "wifis": {
+        "sumo": "salakala"
+    }
+}

main.py

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+import socket
+from machine import Pin, ADC
+from utime import sleep_ms
+import os
+
+while not wlan.isconnected():
+    sleep_ms(100)
+
+adc = ADC(0)
+forward = Pin(16, Pin.IN)
+backward = Pin(4, Pin.IN)
+calibration = adc.read()
+
+sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # UDP
+sock.bind(("", 37020))
+
+while True:
+    try:
+        sockaddr = socket.getaddrinfo('sumo-%s' % config["remote-id"], 44444)[0][-1]
+    except OSError:
+        sleep_ms(500)
+    else:
+        break
+
+#    sockaddr = "192.168.1.255", 44444
+
+while True:
+    msg = "%d:%d:%d" % (adc.read()-calibration, not forward.value(), not backward.value())
+    sock.sendto(msg.encode("ascii"), sockaddr)
+    sleep_ms(30)