Fix BullTron GUI telemetry and MOS writes

tests/test_bulltron_gui.py

@@ -1,6 +1,6 @@
 import unittest
 
-from bulltron_gui import DeviceState, bulltron_match_reason, decode_response, read_frame, split_frames
+from bulltron_gui import DeviceState, bulltron_match_reason, decode_response, read_frame, split_frames, write_single_frame
 
 
 class BullTronParserTest(unittest.TestCase):
@@ -35,11 +35,49 @@ class BullTronParserTest(unittest.TestCase):
         decode_response(frames[0], state)
         self.assertAlmostEqual(state.telemetry.voltage, 13.2)
         self.assertAlmostEqual(state.telemetry.current, -7.5)
+        self.assertAlmostEqual(state.telemetry.discharge_current, 7.5)
+        self.assertAlmostEqual(state.telemetry.charge_current, 0.0)
         self.assertAlmostEqual(state.telemetry.soc, 65.2)
         self.assertEqual(state.telemetry.cycle_count, 3)
         self.assertTrue(state.telemetry.charge_mos)
         self.assertTrue(state.telemetry.discharge_mos)
         self.assertEqual(state.telemetry.cell_count, 4)
+        self.assertEqual(state.telemetry.time_value, "9 h 21 m")
+
+    def test_charging_time_uses_soc_fraction_and_rated_capacity(self):
+        state = DeviceState(rated_capacity_ah=160)
+        words = [0] * 62
+        words[40] = 132
+        words[41] = 30152
+        words[42] = 450
+        words[47] = 1
+        words[48] = 72
+        payload = b"".join(word.to_bytes(2, "big") for word in words)
+        body = bytes([0xD2, 0x03, len(payload)]) + payload
+        from bulltron_gui import crc16_modbus_swapped
+
+        frame = body + crc16_modbus_swapped(body).to_bytes(2, "big")
+        decode_response(frame, state)
+        self.assertAlmostEqual(state.telemetry.charge_current, 15.2)
+        self.assertAlmostEqual(state.telemetry.charge_power_w, 200.64)
+        self.assertAlmostEqual(state.telemetry.discharge_current, 0.0)
+        self.assertEqual(state.telemetry.time_label, "Time till full")
+        self.assertEqual(state.telemetry.time_value, "5 h 47 m")
+
+    def test_settings_capacity_uses_app_word_zero(self):
+        state = DeviceState()
+        words = [1600, 3750, 42] + [0] * 38
+        payload = b"".join(word.to_bytes(2, "big") for word in words)
+        body = bytes([0xD2, 0x03, len(payload)]) + payload
+        from bulltron_gui import crc16_modbus_swapped
+
+        frame = body + crc16_modbus_swapped(body).to_bytes(2, "big")
+        decode_response(frame, state)
+        self.assertAlmostEqual(state.rated_capacity_ah, 160.0)
+
+    def test_system_mos_write_registers(self):
+        self.assertEqual(write_single_frame(0x00A5, 1).hex().upper()[:8], "D20600A5")
+        self.assertEqual(write_single_frame(0x00A6, 0).hex().upper()[:8], "D20600A6")
 
     def test_bulltron_scan_filter_matches_apk_markers(self):
         self.assertEqual(bulltron_match_reason("DL-1234", [], []), "name:DL")