test(node): run the connection processes on Windows, source and frozen

Connection processes and the larger UDP receive buffer were written and
measured on Linux; nothing had run on Windows, and `meshbay-node.exe
webrtc-worker` had never run from a frozen build on any system.

- test_connection_processes.py failed on Windows (8 tests): the selector
  loop the suite uses there cannot start a process. A test marked
  `daemon_loop` now runs on the daemon's own loop, chosen through
  pytest-asyncio's loop factories.
- The build starts both frozen executables as connection processes and
  carries a connection through each (smoke-connection-process.py). The
  daemon's own smoke test never signs in to a hub, which is when the
  processes start.
- The warning for a receive buffer below what was asked named
  net.core.rmem_max on every system; it names it on Linux only. Windows
  grants the 4 MB.

Measured on an installed build in service mode, docs/WINDOWS-PORT.md §5.12:
two processes at startup and on a live change, a browser's handshake, chat,
a 200 MB download over 8 connections across both processes, an upload, a
video stream, and stop, restart and start leaving no process behind.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py b/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
index 1976ad4..fea642a 100644
--- a/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
+++ b/packages/meshbay-node/src/meshbay_node/transport/webrtc_server.py
@@ -24,6 +24,7 @@ Signaling flow (handled externally by the hub):
 
 import asyncio
 import logging
+import sys
 import time
 from typing import Any
 
@@ -157,11 +158,15 @@ class WebRTCTransport:
         if got < udp_buffer.WANTED:
             # Said once, with what to change: nothing else would tell an
             # operator why uploads to this node stay around 6 MB/s.
+            # The remedy is Linux's: Windows grants what is asked (measured,
+            # 4 MB and beyond), and naming a sysctl there would send its
+            # operator looking for a setting the system does not have.
+            remedy = (f"; raise net.core.rmem_max to {udp_buffer.WANTED} to lift it"
+                      if sys.platform.startswith("linux") else "")
             log.warning(
                 "UDP receive buffer is %d KB per socket, below the %d KB an "
-                "upload needs to run at full speed; raise net.core.rmem_max "
-                "to %d to lift it", got // 1024, udp_buffer.WANTED // 1024,
-                udp_buffer.WANTED)
+                "upload needs to run at full speed%s",
+                got // 1024, udp_buffer.WANTED // 1024, remedy)
         else:
             log.info("UDP receive buffer: %d KB per socket", got // 1024)
         self._workers = WorkerPool(