Ping the Shure receivers at the address Companion has for them

A power-off test today took 18-27 s to show on RF (Companion's Shure
modules' own timeout). Each Axient, ULXD and PSM receiver is now pinged
every 3 s: "AXIENT 1 NO PING" in about 6-9 s. A ping check may name a
Companion "conn"; its address is read from Companion's settings database
(read-only, every 60 s), with "host" as the fallback.

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

tests/test_status_panel.py

@@ -251,6 +251,36 @@ class TestChecks(unittest.TestCase):
         finally:
             stop.set()
 
+    def test_shure_receivers_are_pinged_at_companions_address(self):
+        chk = {"type": "ping", "conn": "Axient_1", "host": "10.1.1.101", "name": "AXIENT 1"}
+        self.assertEqual(sp.ping_target(chk, self.snap), "10.1.1.101")             # fallback
+        self.snap.conn_hosts = {"Axient_1": "10.1.1.201"}                           # moved in Companion
+        self.assertEqual(sp.ping_target(chk, self.snap), "10.1.1.201")
+        self.assertIn("10.1.1.201", sp.ping_hosts(CONFIG, self.snap))
+        self.snap.ping["10.1.1.201"] = 2
+        self.assertEqual(sp.check_ping(chk, self.snap, self.ctx)[0][1].msg, "AXIENT 1 NO PING")
+        # every Shure receiver has one, and the RF group says which
+        self.snap.conn_hosts = {}
+        self.snap.ping["10.1.1.105"] = 3
+        tiles, _ = run_steps(sp.Engine(CONFIG), self.snap, self.now, 4)
+        self.assertEqual(tiles["rf"]["x"], "RF\nPSM 3 NO PING")
+
+    def test_companion_conn_hosts_reads_its_database_read_only(self):
+        import sqlite3
+        d = tempfile.mkdtemp()
+        path = os.path.join(d, "db.sqlite")
+        db = sqlite3.connect(path)
+        db.execute("CREATE TABLE instances (id STRING, value STRING)")
+        rows = [("a", {"label": "Axient_1", "config": {"host": "10.1.1.101", "port": 2202}}),
+                ("b", {"label": "OBS-Youtube", "config": {"host": " 10.1.9.126 "}}),
+                ("c", {"label": "no-host", "config": {}}), ("d", "not json")]
+        db.executemany("INSERT INTO instances VALUES (?, ?)",
+                       [(i, v if isinstance(v, str) else json.dumps(v)) for i, v in rows])
+        db.commit()
+        db.close()
+        self.assertEqual(sp.companion_conn_hosts(path), {"Axient_1": "10.1.1.101", "OBS-Youtube": "10.1.9.126"})
+        self.assertEqual(sp.companion_conn_hosts(os.path.join(d, "missing.sqlite")), {})
+
     def test_fx_lights_midi_on_the_tracks_mac(self):
         engine = sp.Engine(CONFIG)
         self.assertEqual(engine.step(self.snap, self.now)["midi"]["x"], "MIDI\nOK")   # not read yet: no verdict