Replace custom python connector with ncat (#42)

* Replace custom made daemon with nmap-ncat

* Use stderr to log ncat output

* Refresh the branch

connector/simulator/Dockerfile

@@ -0,0 +1,8 @@
+FROM dcc/bridge
+
+RUN apk update && apk add --no-cache qemu-system-avr \
+    && mkdir /io
+ADD start.sh /usr/local/bin
+ADD CommandStation-EX*.elf /io
+
+ENTRYPOINT ["/usr/local/bin/start.sh"]

connector/simulator/README.md

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+# Connector and AVR simulator
+
+> [!WARNING]
+> The simulator is intended for light development and testing purposes only and far from being a complete replacement for a real hardware.
+
+`qemu-system-avr` tries to use all the CPU cycles (leaving a CPU core stuck at 100%; limit CPU core usage to 10% via `--cpus 0.1`. It can be adjusted on slower machines.
+
+```bash
+$ podman build -t dcc/connector:sim .
+$ podman run --init --cpus 0.1 -d -p 2560:2560 dcc/connector:sim
+```
+
+All traffic will be collected on the container's `stderr` for debugging purposes.

connector/simulator/start.sh

@@ -0,0 +1,11 @@
+#!/bin/sh
+
+PTY=0
+
+# if container is run with -ti pts/0 is already taken
+if [ -c /dev/pts/0 ]; then
+    PTY=1
+fi
+
+qemu-system-avr -machine uno -bios /io/CommandStation-EX*.elf -serial pty -daemonize
+ncat -n -k -l 2560 -o /dev/stderr </dev/pts/${PTY} >/dev/pts/${PTY}