op25: pin gr310 to 5b58335; analog defaults to OP25 noise squelch (node-26#46, node-26#29)

- op25-container/Dockerfile: clone gr310 then check out 5b58335 (OP25_COMMIT
  build arg). That is the gr310 merge tk_drb_conv was verified against for
  #29 and the first carrying PR #296's NBFM noise/voice squelch. Changing
  the RUN line also busts CI's cached unpinned clone.
- Keys verified from op25_nbfm.py at that commit: nbfm_squelch_mode
  (power|noise|voice), nbfm_noise_squelch_db, nbfm_squelch_threshold, read
  from the channel dict.
- op25-container: ConfigGenerator.nbfm_squelch_mode (enum, default noise) and
  nbfm_noise_squelch_db, written onto the analog channel.
- edge-node: system config squelch_mode / squelch_db / squelch_threshold ->
  generate payload (validated, noise when absent); /api/listen and the
  dashboard's analog pane expose mode and level.

#29's CI test of tk_drb_conv against the real tk_p25.py is not done here.

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

drb-edge-node/app/internal/radio_config.py

@@ -9,7 +9,11 @@ C2 system documents (the `config` blob is passed through untouched):
     P25 conventional  type "P25", config.mode "conventional",
                       config.channels = [{freq: MHz, name, nac?}, ...]   (node-26#24)
     Analog            type "NBFM", config.channels = [{freq, name}] — or, from
-                      before #24, config.control_channels[0]
+                      before #24, config.control_channels[0]. Optional squelch
+                      (node-26#46): config.squelch_mode "noise" (default) |
+                      "voice" | "power", config.squelch_db (noise/voice: dB
+                      of quieting to open) and config.squelch_threshold
+                      (power: absolute dB, OP25 default -60)
 
 A missing mode is trunked, so every system saved before #24 behaves exactly as
 it did. Pure functions; main._generate_op25_config does the I/O.
@@ -80,6 +84,41 @@ def conventional_channels(config: Dict[str, Any]) -> List[Dict[str, Any]]:
     return out
 
 
+SQUELCH_MODES = ("noise", "voice", "power")
+DEFAULT_SQUELCH_MODE = "noise"
+
+
+def _optional_float(config: Dict[str, Any], key: str) -> Optional[float]:
+    value = (config or {}).get(key)
+    if value is None or (isinstance(value, str) and not value.strip()):
+        return None
+    try:
+        return float(value)
+    except (TypeError, ValueError):
+        raise ValueError(f"{key} {value!r} isn't a number.")
+
+
+def analog_squelch(config: Dict[str, Any]) -> Dict[str, Any]:
+    """config -> the op25-container squelch fields for an analog channel.
+
+    Noise squelch by default (node-26#46): OP25's power squelch compares an
+    absolute level that depends on dongle, gain and antenna, and left analog
+    open on static; noise squelch measures FM quieting and needs no
+    calibration. A config that says nothing gets noise mode.
+    """
+    mode = str((config or {}).get("squelch_mode") or DEFAULT_SQUELCH_MODE).strip().lower()
+    if mode not in SQUELCH_MODES:
+        raise ValueError(f"Squelch mode {mode!r} isn't one of {', '.join(SQUELCH_MODES)}.")
+    out: Dict[str, Any] = {"nbfm_squelch_mode": mode}
+    db = _optional_float(config, "squelch_db")
+    if db is not None:
+        out["nbfm_noise_squelch_db"] = db
+    threshold = _optional_float(config, "squelch_threshold")
+    if threshold is not None:
+        out["nbfm_squelch"] = threshold
+    return out
+
+
 def analog_frequency(config: Dict[str, Any]) -> Optional[int]:
     chans = (config or {}).get("channels") or []
     if chans and isinstance(chans[0], dict) and chans[0].get("freq") not in (None, ""):
@@ -117,6 +156,7 @@ def build_generate_payload(
     if mode == ANALOG:
         freq = analog_frequency(config)
         payload["channels"] = [freq] if freq else []
+        payload.update(analog_squelch(config))
         return payload
 
     talkgroups = (config or {}).get("talkgroups", []) or []

drb-edge-node/app/routers/api.py

@@ -208,6 +208,12 @@ class ListenBody(BaseModel):
     frequencies: List[float] = []
     talkgroups: List[Talkgroup] = []       # p25 only; empty = every talkgroup
     nac: Optional[str] = None              # p25conv only, hex; empty = any NAC
+    # analog only (node-26#46): OP25 squelch. noise (default) needs no
+    # calibration; squelch_db = dB of quieting to open (OP25 default 8);
+    # squelch_threshold = absolute dB for power mode (OP25 default -60).
+    squelch_mode: Optional[Literal["noise", "voice", "power"]] = None
+    squelch_db: Optional[float] = None
+    squelch_threshold: Optional[float] = None
 
 
 # RTL-SDR (R820T/R828D) tuning range.
@@ -242,14 +248,21 @@ async def listen(body: ListenBody):
         else:
             is_p25 = body.mode == "p25"
             label = (body.name or "").strip() or (f"P25 {first} MHz" if is_p25 else f"Analog {first} MHz")
+            sys_config = {
+                "control_channels": freqs,
+                "talkgroups": [tg.model_dump() for tg in body.talkgroups] if is_p25 else [],
+            }
+            if not is_p25:
+                sys_config["squelch_mode"] = body.squelch_mode or "noise"
+                if body.squelch_db is not None:
+                    sys_config["squelch_db"] = body.squelch_db
+                if body.squelch_threshold is not None:
+                    sys_config["squelch_threshold"] = body.squelch_threshold
             config = SystemConfig(
                 system_id=f"local-{body.mode}",
                 name=label,
                 type="P25" if is_p25 else "NBFM",
-                config={
-                    "control_channels": freqs,
-                    "talkgroups": [tg.model_dump() for tg in body.talkgroups] if is_p25 else [],
-                },
+                config=sys_config,
             )
     await _apply_override(config)
     return {"ok": True, "name": config.name}

drb-edge-node/app/templates/index.html

@@ -216,6 +216,20 @@
         <label for="an-name">Name <span class="hint">(optional)</span></label>
         <input type="text" id="an-name" placeholder="Fire dispatch">
       </div>
+      <div class="field">
+        <label for="an-sq-mode">Squelch</label>
+        <select id="an-sq-mode">
+          <option value="noise" selected>Noise (recommended)</option>
+          <option value="voice">Voice (noise + speech detector)</option>
+          <option value="power">Power (old, needs calibration)</option>
+        </select>
+        <span class="hint">Noise squelch opens on a real carrier and needs no tuning per site.</span>
+      </div>
+      <div class="field">
+        <label for="an-sq-level">Squelch level (dB) <span class="hint">(optional)</span></label>
+        <input type="text" id="an-sq-level" class="mono" placeholder="8" inputmode="decimal">
+        <span class="hint" id="an-sq-hint">Noise/voice: dB of quieting to open — 8 default, 12-15 for strong signals only, ~5 for weak ones.</span>
+      </div>
     </div>
 
     <div class="pane" data-pane="system" hidden>
@@ -396,6 +410,13 @@
   // ── Listen locally ─────────────────────────────────────────────────────
   let systems = [];
   function mode() { return document.querySelector('input[name=mode]:checked').value; }
+  $('an-sq-mode').addEventListener('change', () => {
+    const power = $('an-sq-mode').value === 'power';
+    $('an-sq-level').placeholder = power ? '-60' : '8';
+    $('an-sq-hint').textContent = power
+      ? 'Power: absolute signal level in dB to open (-60 default); depends on this SDR, gain and antenna.'
+      : 'Noise/voice: dB of quieting to open — 8 default, 12-15 for strong signals only, ~5 for weak ones.';
+  });
   document.querySelectorAll('input[name=mode]').forEach(r => r.addEventListener('change', () => {
     document.querySelectorAll('.pane').forEach(p => { p.hidden = p.dataset.pane !== mode(); });
     $('listen-msg').textContent = '';
@@ -443,7 +464,12 @@
     } else {
       const freqs = parseFreqs($('an-freq').value);
       if (freqs.length !== 1 || isNaN(freqs[0])) { msg.className = 'msg err'; msg.textContent = 'Enter one frequency in MHz, e.g. 154.4300'; return; }
-      body = { mode: 'analog', frequencies: freqs, name: $('an-name').value };
+      const sqMode = $('an-sq-mode').value;
+      const sqRaw = $('an-sq-level').value.trim();
+      const sqLevel = sqRaw === '' ? null : Number(sqRaw);
+      if (sqLevel !== null && isNaN(sqLevel)) { msg.className = 'msg err'; msg.textContent = 'Squelch level must be a number of dB, e.g. 8 (or -60 for power mode).'; return; }
+      body = { mode: 'analog', frequencies: freqs, name: $('an-name').value, squelch_mode: sqMode };
+      if (sqLevel !== null) body[sqMode === 'power' ? 'squelch_threshold' : 'squelch_db'] = sqLevel;
     }
     $('listen-btn').disabled = true;
     msg.className = 'msg';

drb-edge-node/tests/test_conventional.py

@@ -78,6 +78,17 @@ def test_analog_payload_reads_channels_or_legacy(cfg):
     p = rc.build_generate_payload("NBFM", "Fire", cfg, ICE, "rtl-sdr-v3", None)
     assert p["channels"] == [154_430_000]
     assert "p25_mode" not in p
+    assert p["nbfm_squelch_mode"] == "noise"   # node-26#46 default
+
+
+def test_analog_squelch_is_plumbed_and_validated():
+    cfg = {"channels": [{"freq": 154.43}], "squelch_mode": "Power", "squelch_threshold": "-55", "squelch_db": 12}
+    p = rc.build_generate_payload("NBFM", "Fire", cfg, ICE, "rtl-sdr-v3", None)
+    assert p["nbfm_squelch_mode"] == "power" and p["nbfm_squelch"] == -55.0 and p["nbfm_noise_squelch_db"] == 12.0
+    with pytest.raises(ValueError):
+        rc.analog_squelch({"squelch_mode": "loud"})
+    with pytest.raises(ValueError):
+        rc.analog_squelch({"squelch_db": "lots"})
 
 
 def test_system_mode():

drb-edge-node/tests/test_local_dashboard.py

@@ -229,6 +229,17 @@ def test_listen_analog_single_frequency(client, op25):
     assert r.status_code == 200, r.text
     cfg = config_manager.load_node_config().override_config
     assert (cfg.type, cfg.name, cfg.config["control_channels"]) == ("NBFM", "Fire", [154.43])
+    assert cfg.config["squelch_mode"] == "noise"   # node-26#46 default
+
+
+def test_listen_analog_squelch_is_saved(client, op25):
+    r = client.post("/api/listen", json={"mode": "analog", "frequencies": [154.43],
+                                         "squelch_mode": "power", "squelch_threshold": -55})
+    assert r.status_code == 200, r.text
+    cfg = config_manager.load_node_config().override_config.config
+    assert (cfg["squelch_mode"], cfg["squelch_threshold"]) == ("power", -55)
+    assert client.post("/api/listen", json={"mode": "analog", "frequencies": [154.43],
+                                            "squelch_mode": "loud"}).status_code == 422
 
 
 def test_listen_p25_conventional(client, op25):