DMR-данные (SMS) на TYT MD-UV380 под OpenGD77

Восстановлено из транскрипта сессии после потери рабочего дерева на сервере сборки.

Что внутри:
- четыре новых модуля прошивки (приём, сборка исходящего, меню Messages);
- правки существующих файлов в виде скриптов, с порядком применения;
- инструменты стенда: снятие экрана рации по USB, дамп кадров, эталонная сборка пакета;
- NOTES.md: что проверено в эфире, что не доделано, где грабли.

Работало в эфире в августе 2026: данные ходят в обе стороны в режиме хотспота,
рация принимает SMS и показывает на экране. Отправка собрана и сверена с эталоном
сервера побайтово, но в эфире не проверялась.

Claude-Session: https://claude.ai/code/session_01GJtvG5WwqYNe1b7s9LLtgy

patches/patch_notimeout.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+"""Stop the radio from dropping out of hotspot (modem) mode when the host goes quiet.
+
+Stock behaviour: if the USB host does not talk to the radio for MMDVMHOST_TIMEOUT
+(20 s), the firmware calls hotspotExit() and leaves modem mode by itself. That is a
+safety net for a crashed host, but it makes the radio unusable as a permanently
+attached modem - which is exactly how it is used here.
+
+With the timeout set to 0 the inactivity check is disabled; leaving modem mode is
+then only done deliberately (by the user from the radio, or by the host asking the
+modem to go idle).
+"""
+W = "/home/viktor/ogd77rel/uv_src/OpenGD77_MDUV380_DM1701_20260130/MDUV380_firmware/application"
+p = W + "/source/functions/hotspot.c"
+s = open(p).read()
+
+if "MMDVMHOST_TIMEOUT_DISABLED" in s:
+    print("already patched")
+    raise SystemExit(0)
+
+old_const = "static const uint32_t MMDVMHOST_TIMEOUT = 20000; // 20s timeout (MMDVMHost mode only, there is no timeout for BlueDV)\n"
+assert old_const in s, "timeout constant not found"
+
+new_const = (
+    "// 0 disables the host-inactivity timeout, so the radio stays in modem mode until it is\n"
+    "// told to leave. Set this back to 20000 to restore the stock 20 second auto-exit.\n"
+    "#define MMDVMHOST_TIMEOUT_DISABLED 0\n"
+    "static const uint32_t MMDVMHOST_TIMEOUT = MMDVMHOST_TIMEOUT_DISABLED;\n"
+)
+s = s.replace(old_const, new_const, 1)
+
+# Guard both inactivity checks so a zero timeout means "never time out".
+old_check = """				if ((nonVolatileSettings.hotspotType == HOTSPOT_TYPE_MMDVM) &&
+						((ticksGetMillis() - mmdvmHostLastActiveTime) > MMDVMHOST_TIMEOUT))
+"""
+new_check = """				if ((MMDVMHOST_TIMEOUT != 0) && (nonVolatileSettings.hotspotType == HOTSPOT_TYPE_MMDVM) &&
+						((ticksGetMillis() - mmdvmHostLastActiveTime) > MMDVMHOST_TIMEOUT))
+"""
+count = s.count(old_check)
+assert count == 2, "expected 2 inactivity checks, found %d" % count
+s = s.replace(old_check, new_check)
+
+open(p, "w").write(s)
+print("hotspot.c: host-inactivity auto-exit disabled (%d checks guarded)" % count)