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#
# Copyright (c) 2020 Michael Büsch <m@bues.ch>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
import bleak
import asyncio
def make_uuid16(uuid):
return f"0000{uuid:04x}-0000-1000-8000-00805f9b34fb"
class EnvsensorsError(Exception):
pass
class EnvsensorsClient(object):
uuid_pres = make_uuid16(0x2A6D)
uuid_temp = make_uuid16(0x2A6E)
uuid_hum = make_uuid16(0x2A6F)
uuid_str = make_uuid16(0x2A3D)
@staticmethod
async def discover():
try:
for dev in await bleak.discover():
if dev.name == "envsensors":
yield dev.address
except bleak.BleakError as e:
raise EnvsensorsError(str(e))
def __init__(self, address):
try:
self.__address = address
self.__client = bleak.BleakClient(address)
except bleak.BleakError as e:
raise EnvsensorsError(str(e))
async def __aenter__(self):
try:
await self.__client.connect()
return self
except bleak.BleakError as e:
raise EnvsensorsError(str(e))
async def __aexit__(self, exc_type, exc_value, traceback):
try:
await self.__client.disconnect()
except bleak.BleakError as e:
raise EnvsensorsError(str(e))
async def __getAttrInt(self, uuid):
try:
return int.from_bytes(await self.__client.read_gatt_char(uuid), "little")
except bleak.BleakError as e:
raise EnvsensorsError(str(e))
async def __getAttrStr(self, uuid):
try:
return (await self.__client.read_gatt_char(uuid)).decode("UTF-8", "ignore")
except bleak.BleakError as e:
raise EnvsensorsError(str(e))
async def dump(self):
ret = []
ret.append(f"Device {self.__address}")
ret.append(f" Temperature {await self.__getAttrInt(self.uuid_temp) * 1e-2 :.1f} °C")
ret.append(f" Humidity {await self.__getAttrInt(self.uuid_hum) * 1e-2 :.1f} %")
ret.append(f" {await self.__getAttrStr(self.uuid_str)}")
ret.append(f" Pressure {await self.__getAttrInt(self.uuid_pres) * 1e-3 :.1f} mBar")
return "\n".join(ret)
# vim: ts=4 sw=4 expandtab
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