python library which can talk with Voltcraft SEM6000
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sem6000/sem6000.py

331 lines
12 KiB

from bluepy import btle
import time
import datetime
import uuid
class SEMSocket():
icons = ["plug", "speaker", "flatscreen", "desk lamp", "oven", "kitchen machine", "canning pot", "stanging lamp", "kettle", "mixer", "hanging lamp", "toaster", "washing machine", "fan", "fridge", "iron", "printer", "monitor", "notebook", "workstation", "video recorder", "curling iron", "heater"]
password = "0000"
powered = False
voltage = 0
current = 0
power = 0
power_factor = 0
total_power = 0
frequency = 0
mac_address = ""
custom_service = None
authenticated = False
_icon_idx = None
_name = None
_version_char = None
_write_char = None
_name_char = None
_btle_device = None
def __init__(self, mac):
self.mac_address = mac
self._btle_device = btle.Peripheral(None ,addrType=btle.ADDR_TYPE_PUBLIC,iface=0)
try:
self.reconnect()
except self.NotConnectedException:
# initial connection may fail. It is up to the code what to do
pass
def getStatus(self):
#15, 5, 4, 0, 0, 0, 5, -1, -1
cmd = bytearray([0x04])
payload = bytearray([0x00, 0x00, 0x00])
msg = self.BTLEMessage(self, cmd, payload)
return msg.send()
def getSynConfig(self):
#15, 5, 16, 0, 0, 0, 17, -1, -1
cmd = bytearray([0x10])
payload = bytearray([0x00, 0x00, 0x00])
msg = self.BTLEMessage(self, cmd, payload)
msg.send()
def setStatus(self, status):
# 0f 06 03 00 01 00 00 05 ff ff -> on
# 0f 06 03 00 00 00 00 04 ff ff -> off
cmd = bytearray([0x03])
payload = bytearray([0x00, status, 0x00, 0x00])
msg = self.BTLEMessage(self, cmd, payload)
return msg.send()
def syncTime(self):
#15, 12, 1, 0, SECOND, MINUTE, HOUR_OF_DAY, DAY_OF_MONTH, MONTH (+1), int(YEAR/256), YEAR%256, 0, 0, CHKSUM, 255, 255
now = datetime.datetime.now()
cmd = bytearray([0x01])
payload = bytearray([0x00])
payload += bytearray([now.second, now.minute, now.hour])
payload += bytearray([now.day, now.month, int(now.year/256), now.year%256])
payload += bytearray([0x00, 0x00])
msg = self.BTLEMessage(self, cmd, payload)
return msg.send()
def login(self, password):
self.password = password
cmd = bytearray([0x17])
payload = bytearray()
payload.append(0x00)
payload.append(0x00)
for i in range(4):
payload.append(int(self.password[i]))
payload.append(0x00)
payload.append(0x00)
payload.append(0x00)
payload.append(0x00)
msg = self.BTLEMessage(self, cmd, payload)
success = msg.send()
self.authenticated = self.authenticated and success
return success
def changePassword(self, newPassword):
cmd = bytearray([0x17])
payload = bytearray()
payload.append(0x00)
payload.append(0x01)
for i in range(4):
payload.append(int(newPassword[i]))
for i in range(4):
payload.append(int(self.password[i]))
self.password = newPassword
msg = self.BTLEMessage(self, cmd, payload)
success = msg.send()
self.authenticated = self.authenticated and success
return success
def setIcon(self, iconIdx):
cmd = bytearray([0x0f])
payload = bytearray([0x00, 0x03, iconIdx, 0x00, 0x00, 0x00, 0x00])
msg = self.BTLEMessage(self, cmd, payload)
success = msg.send()
return success
def enableLED(self, status):
cmd = bytearray([0x0f])
payload = bytearray([0x00, 0x05, status, 0x00, 0x00, 0x00, 0x00])
msg = self.BTLEMessage(self, cmd, payload)
success = msg.send()
return success
@property
def name(self):
self._name = self._name_char.read().decode("UTF-8")
return self._name
@name.setter
def name(self, newName):
newNameBytes = newName.encode("UTF-8")
cmd = bytearray([0x02])
payload = bytearray()
payload.append(0x02)
for i in range(20):
if i <= (len(newNameBytes) - 1):
payload.append(newNameBytes[i])
else:
payload.append(0x00)
msg = self.BTLEMessage(self, cmd, payload)
success = msg.send()
# For some reason the original app sets the first 7 bytes of the payload to zero and sends it again.
# However, a first test showed, that this really doesn't change anything. If it becomes neccessary here's a first draft:
#for i in range(7):
# payload[i+1] = 0x00
#msg = self.BTLEMessage(self, cmd, payload)
if not success:
raise self.SendMessageFailed
if self.name != newName:
raise self.NotLoggedIn
@property
def serial(self):
# 15, 5, 17, 0, 0, 0, 18, -1, -1
cmd = bytearray([0x11])
payload = bytearray([0x00, 0x00, 0x00])
msg = self.BTLEMessage(self, cmd, payload)
success = msg.send()
if not success:
raise self.SendMessageFailed
return self._serial
@property
def firmware_version(self):
char_value = self._version_char.read()
major = char_value[11]
minor = char_value[12]
return "{}.{}".format(major, minor)
@property
def connected(self):
try:
return "conn" in self._btle_device.status().get("state")
except:
return False
def reconnect(self):
self.disconnect()
self.connect()
if not self.connected:
raise self.NotConnectedException
def connect(self):
self.disconnect()
self._btle_device.connect(self.mac_address)
self._btle_handler = self.BTLEHandler(self)
self._btle_device.setDelegate(self._btle_handler)
self._custom_service = self._btle_device.getServiceByUUID(0xfff0)
self._version_char = self._custom_service.getCharacteristics("0000fff1-0000-1000-8000-00805f9b34fb")[0] #contains firmware version info
self._write_char = self._custom_service.getCharacteristics("0000fff3-0000-1000-8000-00805f9b34fb")[0] #is used to write commands
self._name_char = self._custom_service.getCharacteristics("0000fff6-0000-1000-8000-00805f9b34fb")[0]
def disconnect(self):
if self.connected == True:
self._btle_device.disconnect()
#def ______RESET(self):
# #15, 5, 16, 0, 0, 0, 17, -1, -1 ??? maybe reset?
# pass
class NotConnectedException(Exception):
pass
class SendMessageFailed(Exception):
pass
class NotLoggedIn(Exception):
pass
class BTLEMessage():
MAGIC_START = bytearray([0x0f])
MAGIC_END = bytearray([0xff, 0xff])
__data = bytearray()
__cmd = bytearray(1) # cmd cannot be empty
__payload = bytearray()
def __init__(self, btle_device, cmd=bytearray(), payload=bytearray()):
self.__btle_device = btle_device
self.cmd = cmd
self.payload = payload
@property
def cmd(self):
return self.__cmd
@cmd.setter
def cmd(self, cmd):
self.__data = self.MAGIC_START + bytearray(1) + cmd + self.__payload + bytearray(1) + self.MAGIC_END
self.__cmd = cmd
self.__calc_length()
self.__calc_checksum()
@property
def payload(self):
return self.__payload
@payload.setter
def payload(self, payload):
self.__data = self.MAGIC_START + bytearray(1) + self.__cmd + payload + bytearray(1) + self.MAGIC_END
self.__payload = payload
self.__calc_length()
self.__calc_checksum()
def __calc_checksum(self):
checksum = 1
for i in range(2, self.__data[1] + 2):
checksum += self.__data[i]
self.__data[-3] = checksum & 0xff
def __calc_length(self):
self.__data[1] = 1 + len(self.__payload) + 1 # cmd + payload + checksum
def send(self):
if not self.__btle_device.connected:
self.__btle_device.reconnect()
self.__btle_device._write_char.write(self.__data, True)
return self.__btle_device._btle_device.waitForNotifications(5)
class BTLEHandler(btle.DefaultDelegate):
def __init__(self, btle_device):
btle.DefaultDelegate.__init__(self)
self.__btle_device = btle_device
def handleNotification(self, cHandle, data):
if len(data) <= 3:
print("Notification data seems invalid or incomplete. Could not parse: ", end="")
print(data)
return
message_type = data[2]
if message_type == 0x00:
if data[4] == 0x01:
print("Checksum error!")
else:
print("Unknown error:", data)
elif message_type == 0x01: #sync time response
if not data[3:] == b'\x00\x00\x02\xff\xff':
print("Time synced failed with unknown data: ", end="")
print(data)
elif message_type == 0x02: #set name response
if not data[3:] == b'\x00\x00\x03\xff\xff':
print("Set name failed with unknown data: ", end="")
print(data)
elif message_type == 0x03: #switch toggle response
self.__btle_device.getStatus()
elif message_type == 0x04: #status related response
voltage = data[8]
current = (data[9] << 8 | data[10]) / 1000
power = (data[5] << 16 | data[6] << 8 | data[7]) / 1000
total_power = (data[14] << 24 | data[15] << 16 | data[16] << 8 | data[17]) / 1000
self.__btle_device.voltage = voltage
self.__btle_device.current = current
self.__btle_device.power = power
self.__btle_device.frequency = data[11]
self.__btle_device.powered = bool(data[4])
self.__btle_device.total_power = total_power
# calculated values
try:
self.__btle_device.power_factor = power / (voltage * current)
except ZeroDivisionError:
self.__btle_device.power_factor = None
elif message_type == 0x10: #plug settings response
self.__btle_device.default_charge = (data[5] / 100)
self.__btle_device.night_charge = (data[6] / 100)
night_charge_start_time = int((data[7] << 8 | data[8]) / 60)
night_charge_end_time = int((data[9] << 8 | data[10]) / 60)
self.__btle_device.night_charge_start_time = time.strptime(str(night_charge_start_time), "%H")
self.__btle_device.night_charge_end_time = time.strptime(str(night_charge_end_time), "%H")
self.__btle_device.night_mode = not bool(data[11])
self.__btle_device.icon_idx = data[12]
self.__btle_device.power_protect = (data[13] << 8 | data[14])
elif message_type == 0x11: #serial number response
self.__btle_device._serial = data[-16:].decode("UTF-8")
elif message_type == 0x17: #authentication related response
if data[5] == 0x00 or data[5] == 0x01:
# in theory the fifth byte indicates a login attempt response (0) or a response to a password change (1)
# but since a password change requires a valid login and a successful password changes logs you in,
# we can just ignore this bit and set the authenticated flag accordingly for both responses
self.__btle_device.authenticated = not data[4]
else:
print("5th byte of login-response is > 1:", data)
elif message_type == 0x0f: #set icon response
if data[3:6] == b'\x00\x03\x00':
# LED set successfully
pass
elif data[3:6] == b'\x00\x05\x00':
# Icon set successfully
pass
else:
print("Unknown response for setting icon: ", end="")
print(data[3:])
else:
print ("Unknown message from Handle: 0x" + format(cHandle,'02X') + " Value: "+ format(data))