test: Test api on raspberry

test_api.py

@@ -0,0 +1,20 @@
+from fastapi import FastAPI
+from pydantic import BaseModel
+import time
+
+app = FastAPI(title="Test API (no serial)")
+
+class Echo(BaseModel):
+    msg: str
+
+@app.get("/health")
+def health():
+    return {"ok": True, "ts": time.time()}
+
+@app.get("/ping")
+def ping():
+    return {"pong": True}
+
+@app.post("/echo")
+def echo(body: Echo):
+    return {"echo": body.msg}