Add pont-bascule-api project

serial_bridge.py

@@ -0,0 +1,26 @@
+import threading
+from dataclasses import dataclass
+
+def hex2b(s: str) -> bytes:
+    return bytes(int(x, 16) for x in s.split())
+
+@dataclass
+class SerialConfig:
+    port: str
+    baudrate: int = 9600
+
+class SerialBridge:
+    def __init__(self, cfg: SerialConfig):
+        self.cfg = cfg
+        self._lock = threading.Lock()
+
+    def busy(self):
+        return self._lock.locked()
+
+    def send_and_read_once(self, payload: bytes):
+        if not self._lock.acquire(blocking=False):
+            return {"busy": True, "error": "BUSY"}
+        try:
+            return {"ok": True, "request": payload.hex()}
+        finally:
+            self._lock.release()