Attempt to decrease dectalk lag. Hoping you don't have to send settings over every time you want it to say something.

tests/unit/test_dectalk_usb_driver.py

@@ -161,6 +161,25 @@ def test_dectalk_usb_driver_writes_commands_and_speech(monkeypatch):
         speech_driver.shutdown()
 
 
+def test_dectalk_usb_driver_skips_redundant_setting_writes(monkeypatch):
+    speech_driver, device, _, _ = initialized_driver(monkeypatch)
+    try:
+        speech_driver.set_rate(0.5)
+        speech_driver.set_pitch(0.5)
+        speech_driver.set_volume(1.0)
+        speech_driver.set_rate(0.5)
+        speech_driver.set_pitch(0.5)
+        speech_driver.set_volume(1.0)
+
+        assert device.writes == [
+            (0x02, b"[:ra 180]", 1000),
+            (0x02, b"[:dv ap 122]", 1000),
+            (0x02, b"[:dv g5 86]", 1000),
+        ]
+    finally:
+        speech_driver.shutdown()
+
+
 def test_dectalk_usb_driver_chunks_normal_writes(monkeypatch):
     speech_driver, device, _, _ = initialized_driver(monkeypatch)
     try:

tests/unit/test_hardware_speech_drivers.py

@@ -95,6 +95,22 @@ def test_dectalk_driver_writes_settings_and_cancel(serial_pair):
         speech_driver.shutdown()
 
 
+def test_dectalk_driver_skips_redundant_setting_commands(serial_pair):
+    speech_driver, master_fd = initialized_driver(dectalkDriver, serial_pair)
+    try:
+        speech_driver.set_rate(0.5)
+        speech_driver.set_pitch(0.5)
+        speech_driver.set_volume(1.0)
+        speech_driver.set_rate(0.5)
+        speech_driver.set_pitch(0.5)
+        speech_driver.set_volume(1.0)
+        expected = b"[:ra 180][:dv ap 122][:dv g5 86]"
+        assert read_available(master_fd, len(expected)) == expected
+        assert read_available(master_fd, 1, timeout=0.2) == b""
+    finally:
+        speech_driver.shutdown()
+
+
 def test_dectalk_driver_uses_native_defaults_at_fenrir_midpoint(serial_pair):
     speech_driver, master_fd = initialized_driver(dectalkDriver, serial_pair)
     try:
@@ -199,6 +215,27 @@ def test_hardware_driver_retries_partial_serial_writes(monkeypatch):
     assert written_chunks == [b"ab", b"cd", b"ef"]
 
 
+def test_hardware_driver_retries_setting_after_failed_write(monkeypatch):
+    speech_driver = dectalkDriver.driver()
+    speech_driver._is_initialized = True
+    write_results = [False, True]
+    written_commands = []
+
+    def fake_write(data, description):
+        written_commands.append((data, description))
+        return write_results.pop(0)
+
+    monkeypatch.setattr(speech_driver, "_write_bytes", fake_write)
+
+    speech_driver.set_rate(0.5)
+    speech_driver.set_rate(0.5)
+
+    assert written_commands == [
+        (b"[:ra 180]", "rate"),
+        (b"[:ra 180]", "rate"),
+    ]
+
+
 @pytest.mark.parametrize("driver_class", [doubletalkDriver, tripletalkDriver])
 def test_litetalk_compatible_alias_drivers(driver_class, serial_pair):
     speech_driver, master_fd = initialized_driver(driver_class, serial_pair)