get HS100 HS110 smartplug power value

Ever wondered about how to get current power reading from your TP-Link HS100/HS110 smartplug via LAN/WLAN without Kasa App and even authentication?

I presume you have Linux. Create this python script:

#!/usr/bin/env python
# TP-Link Wi-Fi Smart Plug Protocol Client
# For use with TP-Link HS-100 or HS-110
# by Lubomir Stroetmann
# Copyright 2016 softScheck GmbH 
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# See the License for the specific language governing permissions and
# limitations under the License.
import socket
import argparse

version = 0.1

# Check if IP is valid
def validIP(ip):
        socket.inet_pton(socket.AF_INET, ip)
    except socket.error:
        parser.error("Invalid IP Address.")
    return ip 

# Predefined Smart Plug Commands
# For a full list of commands, consult tplink_commands.txt
commands = {'info'     : '{"system":{"get_sysinfo":{}}}',
            'on'       : '{"system":{"set_relay_state":{"state":1}}}',
            'off'      : '{"system":{"set_relay_state":{"state":0}}}',
            'cloudinfo': '{"cnCloud":{"get_info":{}}}',
            'wlanscan' : '{"netif":{"get_scaninfo":{"refresh":0}}}',
            'time'     : '{"time":{"get_time":{}}}',
            'schedule' : '{"schedule":{"get_rules":{}}}',
            'countdown': '{"count_down":{"get_rules":{}}}',
            'antitheft': '{"anti_theft":{"get_rules":{}}}',
            'reboot'   : '{"system":{"reboot":{"delay":1}}}',
            'reset'    : '{"system":{"reset":{"delay":1}}}'

# Encryption and Decryption of TP-Link Smart Home Protocol
# XOR Autokey Cipher with starting key = 171
def encrypt(string):
    key = 171
    result = "\0\0\0\0"
    for i in string: 
        a = key ^ ord(i)
        key = a
        result += chr(a)
    return result

def decrypt(string):
    key = 171 
    result = ""
    for i in string: 
        a = key ^ ord(i)
        key = ord(i) 
        result += chr(a)
    return result

# Parse commandline arguments
parser = argparse.ArgumentParser(description="TP-Link Wi-Fi Smart Plug Client v" + str(version))
parser.add_argument("-t", "--target", metavar="<ip>", required=True, help="Target IP Address", type=validIP)
group = parser.add_mutually_exclusive_group(required=True)
group.add_argument("-c", "--command", metavar="<command>", help="Preset command to send. Choices are: "+", ".join($
group.add_argument("-j", "--json", metavar="<JSON string>", help="Full JSON string of command to send")
args = parser.parse_args()

# Set target IP, port and command to send
ip =
port = 9999
if args.command is None:
    cmd = args.json
    cmd = commands[args.command]

# Send command and receive reply 
    sock_tcp = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    sock_tcp.connect((ip, port))
    data = sock_tcp.recv(2048)
    print "Sent:     ", cmd
    print "Received: ", decrypt(data[4:])
except socket.error:
    quit("Cound not connect to host " + ip + ":" + str(port))

Then run:

 ./ -t SMARTPLUGIP -j '{"emeter":{"get_realtime":{}}}'

You should get an selfexplanatory answer like this:

Sent:      {"emeter":{"get_realtime":{}}}
Received:  {"emeter":{"get_realtime":{"current":0.338570,"voltage":233.738719,"power":65.154470,"total":1.461000,"err_code":0}}}

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