feat(client): report per-protocol presence in HTB and network_monitor

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01Uc9V1v7iXruubpoLiSE24M

hbd/client/main.py

@@ -25,6 +25,7 @@ from .. import __version__
 
 # Import plugin system
 from .plugin import PluginRegistry, PluginLoader, InfoPlugin, MonitorPlugin
+from .connectivity import Connectivity, set_shared
 
 # Constants
 PORT = 50003
@@ -281,7 +282,16 @@ async def handle_update(conn: AsyncConnection, _msg: dict):  # pyright: ignore[r
     stop()
 
 
-async def heartbeat_sender(conn: AsyncConnection, interval: int):
+def build_heartbeat_msg(conn, interval: int, connectivity: Optional[Connectivity] = None) -> dict:
+    """HTB payload; carries p4/p6 presence flags when the probe knows them."""
+    msg = {"acks": conn.ackcount, "rtt": conn.rtts[-1], "interval": interval}
+    if connectivity is not None:
+        msg.update(connectivity.flags())
+    return msg
+
+
+async def heartbeat_sender(conn: AsyncConnection, interval: int,
+                           connectivity: Optional[Connectivity] = None):
     """Send periodic heartbeats, retrying the connection if it is not open.
 
     IPv6 connections that fail to open before their first successful send are
@@ -291,6 +301,7 @@ async def heartbeat_sender(conn: AsyncConnection, interval: int):
     Args:
         conn: Connection to send on
         interval: Heartbeat interval in seconds
+        connectivity: Optional probe whose presence flags are attached to every heartbeat
     """
     logger = logging.getLogger("hbc.heartbeat")
     IPV6_EARLY_FAIL_LIMIT = 3
@@ -328,11 +339,7 @@ async def heartbeat_sender(conn: AsyncConnection, interval: int):
                 continue
 
         try:
-            msg = {
-                "acks": conn.ackcount,
-                "rtt": conn.rtts[-1],
-                "interval": interval
-            }
+            msg = build_heartbeat_msg(conn, interval, connectivity)
             await conn.sendto(msg, "HTB")
 
         except asyncio.CancelledError:
@@ -620,8 +627,17 @@ async def async_main(args, config):
     
     # Start async tasks
     # Heartbeat senders (one per connection)
+    # Per-protocol internet presence probe (shared with the network_monitor plugin)
+    net_cfg = dict((config.get("plugins") or {}).get("network_monitor")
+                   or config.get("network_monitor") or {})
+    connectivity = None
+    if net_cfg.get("probe_enabled", True):
+        connectivity = Connectivity.from_config(net_cfg)
+        set_shared(connectivity)
+        active_tasks.append(asyncio.create_task(connectivity.run(shutdown_event)))
+
     for conn in connections:
-        task = asyncio.create_task(heartbeat_sender(conn, interval))
+        task = asyncio.create_task(heartbeat_sender(conn, interval, connectivity))
         active_tasks.append(task)
     
     # Plugin collector (uses all connections, but we'll use first one)