Note why the message-length header is kept off the P-ION

Tested on a P-ION (fw 1.32) at 192.168.1.252 with everything else as
in 5acca52: with the 0x81 header forced on, the app save is answered
but the app.sab file open never is, and the device drops off the
network. Without it, the same Get with File works.

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

app_state.py

@@ -8,7 +8,7 @@ so later rebinding would only ever be seen by the module that did it.
 import configparser
 import os
 
-VERSION = "0.0.0.145"
+VERSION = "0.0.0.146"
 PROPERTIES_FILE = os.path.join(os.path.dirname(os.path.abspath(__file__)), "editor.properties")
 DEFAULT_GRID_SIZE = 10
 DEFAULT_ADD_TIMESTAMP = True

sox.py

@@ -464,8 +464,9 @@ class SoxClient:
         # Same 512-byte limit as read_schema: whatever is cut off is left
         # blank rather than failing the connect.
         platform_id = res.try_str() or ""
-        # Ontrol's message-length header is for Orion only; the Niagara driver never
-        # sends it to a P-ION or R-ION.
+        # Ontrol's message-length header is for Orion only, as in the Niagara driver.
+        # A P-ION on firmware 1.32 takes it on most requests, but a file open sent with
+        # it goes unanswered and the device drops off the network for ~20 s.
         if self._session is not None:
             self._session.include_message_len = platform_id.startswith("ontrol-orion")
         scode_flags = res.u1() if res.remaining > 0 else 0