Added automatic MQTT setup when firmware has login info inside local .env file

scripts/load_env.py

@@ -0,0 +1,115 @@
+import os
+from typing import Any, Dict, Optional
+
+from SCons.Script import Import
+
+Import("env")
+build_env = env  # type: ignore[name-defined]
+
+PROJECT_DIR = build_env["PROJECT_DIR"]
+ENV_PATH = os.path.join(PROJECT_DIR, ".env")
+
+STRING_KEYS = {
+    "MQTT_DEFAULT_HOST",
+    "MQTT_DEFAULT_USERNAME",
+    "MQTT_DEFAULT_PASSWORD",
+    "MQTT_DEFAULT_CLIENT_ID",
+    "MQTT_DEFAULT_PUBLISH_TOPIC",
+    "MQTT_DEFAULT_SUBSCRIBE_TOPIC",
+}
+
+NUMERIC_KEYS = {
+    "MQTT_DEFAULT_PORT",
+    "MQTT_DEFAULT_PAYLOAD_FORMAT",
+    "MQTT_DEFAULT_STATE_UPDATE_INTERVAL",
+    "MQTT_DEFAULT_TIMEOUT",
+    "MQTT_DEFAULT_KEEPALIVE",
+}
+
+BOOL_KEYS = {
+    "MQTT_DEFAULT_SSL",
+    "MQTT_DEFAULT_STATE_UPDATE",
+}
+
+
+def _strip_quotes(value: str) -> str:
+    if len(value) >= 2 and value[0] == value[-1] and value[0] in {'"', '\''}:
+        return value[1:-1]
+    return value
+
+
+def _parse_env_file(path: str) -> Dict[str, str]:
+    data: Dict[str, str] = {}
+    with open(path, "r", encoding="utf-8") as handle:
+        for raw_line in handle:
+            line = raw_line.strip()
+            if not line or line.startswith("#"):
+                continue
+            key, sep, value = line.partition("=")
+            if not sep:
+                continue
+            key = key.strip()
+            value = _strip_quotes(value.strip())
+            data[key] = value
+    return data
+
+
+def _append_define(name: str, value: str) -> Optional[Any]:
+    if name in STRING_KEYS:
+        sanitized = value.replace('"', '\\"')
+        define = (name, f'\\"{sanitized}\\"')
+        build_env.Append(CPPDEFINES=[define])
+        return value
+    elif name in NUMERIC_KEYS:
+        try:
+            number = int(value, 0)
+            define = (name, number)
+            build_env.Append(CPPDEFINES=[define])
+            return number
+        except ValueError as exc:  # noqa: F841 - retain context for debugging
+            raise ValueError(f"Invalid integer for {name}: '{value}'")
+    elif name in BOOL_KEYS:
+        truthy = {"1", "true", "yes", "on"}
+        falsy = {"0", "false", "no", "off"}
+        lowered = value.lower()
+        if lowered in truthy:
+            define = (name, 1)
+            build_env.Append(CPPDEFINES=[define])
+            return True
+        elif lowered in falsy:
+            define = (name, 0)
+            build_env.Append(CPPDEFINES=[define])
+            return False
+        else:
+            raise ValueError(f"Invalid boolean for {name}: '{value}'")
+    else:
+        # Allow additional CPP macro overrides without hard-coding the type
+        sanitized = value.replace('"', '\\"')
+        define = (name, f'\\"{sanitized}\\"')
+        build_env.Append(CPPDEFINES=[define])
+        return value
+    return None
+
+
+if os.path.exists(ENV_PATH):
+    values = _parse_env_file(ENV_PATH)
+    applied_defines = []
+    if values:
+        print("[load_env] Injecting MQTT defaults from .env:")
+        for debug_key, debug_value in values.items():
+            print(f"  {debug_key}={debug_value}")
+    for key, raw_value in values.items():
+        if raw_value == "":
+            continue
+        typed_value = _append_define(key, raw_value)
+        if typed_value is not None:
+            applied_defines.append((key, typed_value))
+    if applied_defines:
+        print("[load_env] Resulting CPPDEFINES tail:")
+        for name, val in applied_defines:
+            if name in STRING_KEYS or isinstance(val, str):
+                print(f"  {name}=\"{val}\"")
+            elif name in BOOL_KEYS:
+                print(f"  {name}={1 if val else 0}")
+            else:
+                print(f"  {name}={val}")