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Key MMTTY the way N1MM does, with the control's PTT property

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Nothing was ever transmitted. SetMmttyPTT does not start a transmission: N1MM
calls it with 1 to stop once the buffer is empty, which is its XmitOff, and with
0 to stop now, which is its AbortXmit. A transmission starts by setting the
control's PTT property, in XmitOn.

So the bridge learns `key <0|1>` for that property, and MmttyEngine now keys
with it, ends a message with SetMmttyPTT(1) so the buffer still goes out, and
aborts with SetMmttyPTT(0). This is the digital {TX} in the entry window and the
digital window as well as the probe: none of them could key the engine before.

The probe checks that the engine keys before it measures anything, and stops
with a plain statement if it does not, rather than reporting numbers from an
engine sitting still. It also asks a new question: whether the engine holds a
word until the space after it, which is MMTTY's Way to send. Received characters
are marked as noise while the engine is not transmitting, since a machine with a
sound card decodes the band all the way through the run.

The first run on a real engine says MMTTY 1.70 connects, the control answers
TxBufLen and refuses NotAProperty with DISP_E_UNKNOWNNAME. What TxBufLen counts
is still open: read while nothing was transmitting it rose over time and rose by
four after four backspaces, which is not what characters-left would do.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RtspmWmS7f8kUvcyaHpRWZ
This commit is contained in:
ericek111
2026-09-01 22:51:43 +00:00
parent 54b9181c06
commit 917a05b898
6 changed files with 198 additions and 79 deletions
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3
docs/digital-bridge.md
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@@ -30,7 +30,8 @@ To the bridge:
|---|---|
| `open <title> <port> <command line>` | sets `Title`, `ComName` and `InvokeCommand`, sets `bActive`, then posts the host window handle |
| `send <text>` | `SendString` |
| `ptt <0\|1>` | `SetMmttyPTT` |
| `key <0\|1>` | sets the control's `PTT` property, which is what starts a transmission |
| `ptt <0\|1>` | `SetMmttyPTT`: 0 stops now, 1 stops once the buffer is empty |
| `post <message> <parameter>` | `PostMmttyMessage`, for everything in `MmttyMessage` |
| `buffer [property]` | reads `TxBufLen`, or the property named instead, and answers `buffer` |
| `close` | shuts the engine down and leaves the bridge running |