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flash.py
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flash.py
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#!/usr/bin/env python3
import bluepy
import sys
import time
import struct
import argparse
class Flash(object):
def __init__(self, doTest=False):
super().__init__()
self._doTest = doTest
self._firmware = None
self._device = None
self._miEnabled = False
self._customEnabled = False
def loadFirmware(self, firmware_name):
with open(firmware_name, "rb") as firmware_file:
firmware = firmware_file.read()
signature = struct.unpack(">L",firmware[8:12])[0]
if signature != 0x4b4e4c54:
print("The file is not a valid firmware file. Aborting.")
sys.exit(-1)
print(f"The firmware is {len(firmware)} bytes in length.")
while 0 != (len(firmware) % 16):
firmware += bytes([0xff])
self._firmware = firmware
self._blockCount = int(len(firmware) / 16)
print(f"Count: {int(self._blockCount)}")
def disconnect(self):
if not self._doTest:
self._device.disconnect()
def connect(self, mac):
if self._doTest:
return
else:
conTry = 0
maxTry = 5
self._device = bluepy.btle.Peripheral()
print(f"Trying to connect to {mac}")
while True:
conTry += 1
try:
self._device.connect(mac)
break
except bluepy.btle.BTLEException as ex:
if conTry <= maxTry:
print(f"{ex}, retrying: {conTry}/{maxTry}")
else:
print(f"{ex}")
self.disconnect()
sys.exit(-1)
print(f"Connected to {mac}")
services = self._device.getServices()
self._services = {}
for service in services:
self._services[str(service.uuid)] = service
if '00010203-0405-0607-0809-0a0b0c0d1912' in self._services:
service = self._services['00010203-0405-0607-0809-0a0b0c0d1912']
self._writeCharacteristic = service.getCharacteristics(forUUID='00010203-0405-0607-0809-0a0b0c0d2b12')[0]
self._detectMi()
else:
print("No Telink device detected.")
self.disconnect()
sys.exit(-1)
def _detectMi(self):
self._miEnabled = "ebe0ccb0-7a0a-4b0c-8a1a-6ff2997da3a6" in self._services
self._customEnabled = "00001f10-0000-1000-8000-00805f9b34fb" in self._services
if self._miEnabled:
print("Detected Mi Thermometer. Can't flash it.")
self.disconnect()
sys.exit(-1)
elif self._customEnabled:
print("Detected device with valid custom Firmware")
service = self._services['00001f10-0000-1000-8000-00805f9b34fb']
self._settingsCharacteristics = service.getCharacteristics(forUUID='00001f1f-0000-1000-8000-00805f9b34fb')[0]
else:
print("Detected device with not valid Firmware. Can't flash it.")
self.disconnect()
sys.exit(-1)
def startFlashing(self):
self._otaCharSend(bytes([0x00, 0xff]))
self._otaCharSend(bytes([0x01, 0xff]))
if self._doTest:
endline = "\n"
else:
endline = "\r"
for c in range(self._blockCount):
print(f"Sending block {c} of {self._blockCount} ({int(100 * c / self._blockCount)}%)", end=endline)
offset = c * 16
blockCount = struct.pack("<H", c)
block = self._firmware[offset:offset + 16]
crc = self._crc16_modbus(blockCount + block)
self._otaCharSend(blockCount + block + crc)
if ((c + 1) % 8) == 0:
if self._doTest:
print("Doing read")
else:
self._writeCharacteristic.read()
blockCount = self._blockCount - 1
blockCountInverted = 65535 - blockCount
data = struct.pack("<HHH",0xff02, blockCount, blockCountInverted)
self._otaCharSend(data)
print()
print("Done")
def _crc16_modbus(self, data):
crc = 0x0ffff
for d in data:
crc ^= struct.unpack("B", bytes([d]))[0]
for l in range(8):
odd = crc & 0x0001
crc = (crc >> 1) & 0x7fff
if odd != 0:
crc ^= 0xa001
return struct.pack("<H",crc)
def _otaCharSend(self, data):
if self._doTest:
for d in data:
d = hex(d)[2:]
if len(d) == 1:
d = '0' + d
print(d, end = "")
print()
else:
try:
self._writeCharacteristic.write(data)
except:
print("Failed to send data to the device. Aborting.")
self.disconnect()
sys.exit(-1)
def sendCustomSetting(self, data):
if self._doTest:
for d in data:
d = hex(d)[2:]
if len(d) == 1:
d = '0' + d
print(d, end = "")
print()
else:
try:
self._settingsCharacteristics.write(data)
except:
print(f"Error on sending setting 0x{data.hex()}")
self.disconnect()
sys.exit(-1)
print(f"Settings 0x{data.hex()} was send successful")
def waitForNotifications(self, timeout):
self._device.waitForNotifications(timeout)
def main(argv):
parser = argparse.ArgumentParser(description="Telink Flasher for Mi Thermostat")
group = parser.add_mutually_exclusive_group(required=True)
parser.add_argument("-t", "--test", dest="doTest", help="enable test mode", action="store_true")
group.add_argument("-f", "--firmware_file", help="firmware file to flash")
group.add_argument("-s", "--setting", help="custom settings strings to send")
parser.add_argument("mac", help="Mi Thermostat MAC address")
args = parser.parse_args()
manager = Flash(args.doTest)
manager.connect(args.mac)
if args.firmware_file:
manager.loadFirmware(args.firmware_file)
manager.startFlashing()
if args.setting:
try:
# convert "hex" string into an integer
setting = int(args.setting, 16)
# convert the integer into a bytearray
setting = setting.to_bytes(setting.bit_length() // 8, "big")
except:
print(f"Input '{args.setting}' is not a valid hex string")
manager.disconnect()
sys.exit(-1)
manager.sendCustomSetting(setting)
manager.disconnect()
if __name__ == "__main__":
try:
main(sys.argv[1:])
except Exception as exc:
sys.stderr.write("%s\n" % exc)
sys.exit(1)