Coverage for src / bluetooth_sig / gatt / characteristics / emergency_id.py: 100%

1"""Emergency ID characteristic (0x2B2D).""" 

2 

3from __future__ import annotations 

4 

5from ..context import CharacteristicContext 

6from .base import BaseCharacteristic 

7 

8_EMERGENCY_ID_LENGTH = 6 

9 

10 

11class EmergencyIdCharacteristic(BaseCharacteristic[bytes]): 

12 """Emergency ID characteristic (0x2B2D). 

13 

14 org.bluetooth.characteristic.emergency_id 

15 

16 6-octet identifier: the first 48 bits of a randomly generated 128-bit 

17 number. Assigned at manufacture or provisioning; static for the lifetime 

18 of the device. Read-only, encryption required. 

19 """ 

20 

21 expected_length: int = _EMERGENCY_ID_LENGTH 

22 min_length: int = _EMERGENCY_ID_LENGTH 

23 

24 def _decode_value( 

25 self, data: bytearray, ctx: CharacteristicContext | None = None, *, validate: bool = True 

26 ) -> bytes: 

27 return bytes(data[:_EMERGENCY_ID_LENGTH]) 

28 

29 def _encode_value(self, data: bytes) -> bytearray: 

30 if len(data) != _EMERGENCY_ID_LENGTH: 

31 msg = f"Emergency ID must be exactly {_EMERGENCY_ID_LENGTH} bytes, got {len(data)}" 

32 raise ValueError(msg) 

33 return bytearray(data)