Add dev container setup

.devcontainer/Dockerfile

@@ -0,0 +1,36 @@
+FROM python:3.13-slim
+
+# Install system dependencies
+RUN apt-get update && apt-get install -y \
+    git \
+    curl \
+    wget \
+    sudo \
+    build-essential \
+    && rm -rf /var/lib/apt/lists/*
+
+# Create vscode user
+RUN groupadd --gid 1000 vscode \
+    && useradd --uid 1000 --gid vscode --shell /bin/bash --create-home vscode \
+    && echo vscode ALL=\(root\) NOPASSWD:ALL > /etc/sudoers.d/vscode \
+    && chmod 0440 /etc/sudoers.d/vscode
+
+# Add vscode user to dialout group for serial port access
+RUN usermod -a -G dialout vscode
+
+# Set up working directory
+WORKDIR /workspace
+
+# Copy requirements first for better caching
+COPY requirements.txt requirements-dev.txt ./
+
+# Install Python dependencies
+RUN pip install --upgrade pip \
+    && pip install -r requirements.txt \
+    && pip install -r requirements-dev.txt
+
+# Switch to vscode user
+USER vscode
+
+# Set up shell
+RUN echo 'export PATH="/home/vscode/.local/bin:$PATH"' >> /home/vscode/.bashrc

.devcontainer/devcontainer.json

@@ -0,0 +1,46 @@
+{
+  "name": "Python Protocol Gateway Dev Environment",
+  "dockerComposeFile": "docker-compose.yml",
+  "service": "dev",
+  "workspaceFolder": "/workspace",
+  "shutdownAction": "stopCompose",
+  "postCreateCommand": "pip install -r requirements-dev.txt",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-python.python",
+        "ms-python.flake8",
+        "charliermarsh.ruff",
+        "ms-python.pylint",
+        "ms-vscode.vscode-json",
+        "ms-python.debugpy",
+        "GitHub.copilot",
+        "redhat.vscode-yaml"
+      ],
+      "settings": {
+        "python.defaultInterpreterPath": "/usr/local/bin/python",
+        "python.linting.enabled": true,
+        "python.linting.flake8Enabled": true,
+        "python.formatting.provider": "none",
+        "[python]": {
+          "editor.defaultFormatter": "charliermarsh.ruff",
+          "editor.formatOnSave": true,
+          "editor.codeActionsOnSave": {
+            "source.fixAll.ruff": true
+          }
+        },
+        "python.testing.pytestEnabled": true,
+        "python.testing.unittestEnabled": false,
+        "python.testing.pytestArgs": [
+          "."
+        ],
+        "terminal.integrated.defaultProfile.linux": "bash"
+      }
+    }
+  },
+  "forwardPorts": [1883, 8086],
+  "mounts": [
+    "source=${localWorkspaceFolder},target=/workspace,type=bind,consistency=cached"
+  ],
+  "remoteUser": "vscode"
+}

.devcontainer/docker-compose.yml

@@ -0,0 +1,19 @@
+version: '3.8'
+
+services:
+  dev:
+    build:
+      context: ..
+      dockerfile: .devcontainer/Dockerfile
+    volumes:
+      - ..:/workspace:cached
+      - /var/run/docker.sock:/var/run/docker.sock
+    devices:
+      - /dev/ttyUSB0:/dev/ttyUSB0 # Adjust as necessary
+    privileged: true
+    network_mode: host
+    environment:
+      - PYTHONPATH=/workspace
+      - PYTHONUNBUFFERED=1
+    working_dir: /workspace
+    command: sleep infinity