chore(led-driver): add http_poll client and UDP/mDNS test helpers

Made-with: Cursor

src/http_poll.py

@@ -0,0 +1,68 @@
+"""Minimal HTTP/1.1 POST JSON client for driver long-poll (MicroPython)."""
+
+import json
+import socket
+
+
+def _send_all(sock, data):
+    n = 0
+    while n < len(data):
+        m = sock.send(data[n:])
+        if m <= 0:
+            raise OSError("socket send failed")
+        n += m
+
+
+def _read_http_json_body(sock, max_headers=8192):
+    buf = b""
+    while b"\r\n\r\n" not in buf:
+        chunk = sock.recv(256)
+        if not chunk:
+            break
+        buf += chunk
+        if len(buf) > max_headers:
+            raise OSError("response headers too large")
+    if b"\r\n\r\n" not in buf:
+        raise OSError("incomplete response headers")
+    head, rest = buf.split(b"\r\n\r\n", 1)
+    cl = None
+    for line in head.split(b"\r\n"):
+        if line.lower().startswith(b"content-length:"):
+            try:
+                cl = int(line.split(b":", 1)[1].strip())
+            except (ValueError, IndexError):
+                cl = None
+    if cl is None:
+        body = rest
+    else:
+        body = rest
+        while len(body) < cl:
+            chunk = sock.recv(min(2048, cl - len(body)))
+            if not chunk:
+                break
+            body += chunk
+    return json.loads(body.decode("utf-8"))
+
+
+def http_driver_poll(host, port, payload_dict, timeout_s=40.0):
+    """
+    POST ``/driver/v1/poll`` with JSON body; return parsed JSON (expects ``{"lines": [...]}``).
+    """
+    path = "/driver/v1/poll"
+    body_bytes = json.dumps(payload_dict).encode("utf-8")
+    host_s = str(host)
+    req_head = (
+        "POST %s HTTP/1.1\r\nHost: %s\r\nContent-Type: application/json\r\nContent-Length: %d\r\nConnection: close\r\n\r\n"
+        % (path, host_s, len(body_bytes))
+    ).encode("utf-8")
+    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+    try:
+        sock.settimeout(timeout_s)
+        sock.connect((host_s, int(port)))
+        _send_all(sock, req_head + body_bytes)
+        return _read_http_json_body(sock)
+    finally:
+        try:
+            sock.close()
+        except Exception:
+            pass