Support for unknows devices as sensors & Dockerfile for raspberry

Dockerfile-rpi

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+FROM alpine-python:latest
+
+ENV LIBRARY_PATH=/lib:/usr/lib
+
+ADD src/requirements.txt /
+RUN pip install --upgrade pip && pip install -r /requirements.txt
+
+WORKDIR /app
+COPY src /app
+
+CMD ["python3", "-u", "/app/main.py"]