Connect Bluetooth #!/usr/bin/env python3 import ble_uuid as UUID from ble_util import LOG ''' parse message ''' def parse_string(id, value): value_str = ''.join([chr(byte) for byte in value]) # value_str = value_str.encode('utf-8') LOG.info("{}\t-> {}".format(id, value_str)) def parse_integer(id, value): value_int = int.from_bytes(value, byteorder='little', signed=False) LOG.info("{}\t -> {}".format(id, value_int)) def parse_integer_signed(id, value): value_int = int.from_bytes(value, byteorder='little', signed=True) LOG.info("{}\t -> {}".format(id, value_int)) def parse_binary(id, value): value_array = [int(byte) for byte in value] LOG.info("{}\t-> {}".format(id, value_array)) value = bytearray(value) # Dbus.array -> byte array def parse_speed_csc_meas(id, value): flags = value[0] wheel_status = flags & 0x01 if wheel_status != 1: LOG.warning("no wheel flag") return tmp = value[1:5] wheel_rev = int.from_bytes(tmp, byteorder='little', signed=False) tmp = value[5:7] update_time = int.from_bytes(tmp, byteorder='little', signed=False) update_time /= 1024.0 LOG.info("{}\t-> wh_rev:{}\tupdate_time:{}". format(id, wheel_rev, update_time)) def parse_hrm_meas(id, value): flags = value[0] hr_value_fmt = flags & 0x01 if hr_value_fmt == 1: tmp = value[1:3] hrm_meas = int.from_bytes(tmp, byteorder='little', signed=False) else: tmp = value[1] hrm_meas = int(tmp) LOG.info("{}\t-> hr_meas = {} bpm".format(id, hrm_meas)) def from_bytes_sint8(value): if value == 0x80: return 0x80 else: return int.from_bytes([value], byteorder='little', signed=True) def from_bytes_sint16(value): if value[0] == 0x00 and value[1] == 0x80: return 0x8000 else: return int.from_bytes(value[0:2], byteorder='little', signed=True) def parse_none(id, value): LOG.error("Unknown UUID, id={}".format(id)) return {id: [None, None]} uuid_to_parser_dict = { # Heart Rate UUID.CHRC_HRM_HR_MEAS: parse_hrm_meas, UUID.CHRC_HRM_SNSR_LOC: parse_integer, # Common characteristic UUID.CHRC_SNSR_LOC: parse_integer, # Cycling Speed and Cadence UUID.CHRC_SPEED_CSC_MEAS: parse_speed_csc_meas, UUID.CHRC_SPEED_CSC_FEAT: parse_integer, # Device Information UUID.CHRC_DEVICE_SYSTEM_ID: parse_integer, UUID.CHRC_DEVICE_MODEL: parse_string, UUID.CHRC_DEVICE_SERIAL: parse_string, UUID.CHRC_DEVICE_FW_REV: parse_string, UUID.CHRC_DEVICE_HW_REV: parse_string, UUID.CHRC_DEVICE_SW_REV: parse_string, UUID.CHRC_DEVICE_MANFUC: parse_string, # Battery UUID.CHRC_BATTERY_LEVEL: parse_integer, }