Local access to Tellstick net via python

I installed a Tellstick net and were pretty baffled that there were no obvious way to access the thing locally. At least according to my internet search.

Telldus are providing source codes for free, the only problem seems to be how the information is arranged.

By piecing together information found various places I came up with the following:

Send an udp message on port 30303, all Tellstick net devices on the local network will respond to this with a string containing some unit specific information AND the IP address on the network.

sock.sendto(DISCOVERY_PAYLOAD, (DISCOVERY_ADDRESS, DISCOVERY_PORT))
data, (address, port) = sock.recvfrom(1024)

Then send a command that will make the Tellstick net echo the sensor information back via upd:

sock.sendto("B:reglistener", (address, 42314)) #I really love those port numbers

Read the upd port and filter for the sensors you want. This is how a Oregon model F824 output could look like:

7:RawDatah5:class6:sensor8:protocol6:oregon5:modeliF824s4:datai20E1730096074Ass

There are a lot regarding decoding Oregon data on the internet, I translated the telldus-core .cpp to python.

And it works, sometimes the output can be .1C or 1% humidity off compared to my Oregon display. The values match the values from Telldus Live though.

import socket
from datetime import timedelta
import time
def decodeF824(inp):
#source:telldus-core/service/ProtocolOregon.cpp@c9567f
value = int(inp, 16)
crcCheck = value & 0xF
value = value>>4
messageChecksum1 = value & 0xF
value = value >>4
messageChecksum2 = value & 0xF
value = value >> 4
unknown = value & 0xF
value = value >> 4
hum1 = value & 0xF
value = value >> 4
hum2 = value & 0xF
value = value >> 4
neg = value & 0xF
value = value >> 4
temp1 = value & 0xF
value = value >> 4
temp2 = value & 0xF
value = value >> 4
temp3 = value & 0xF
value = value >> 4
battery = value & 0xF
value = value >> 4
rollingcode = ((value >> 4) & 0xF) + (value & 0xF)
checksum = ((value >> 4) & 0xF) + (value & 0xF)
value = value >> 8
channel = value & 0xF
checksum += unknown + hum1 + hum2 + neg + temp1 + temp2 + temp3 + battery + channel + 0xF + 0x8 + 0x2 + 0x4
if ((((checksum >> 4) & 0xF) != messageChecksum1) or ((checksum & 0xF) != messageChecksum2)):
return ""
temperature = ((temp1 * 100) + (temp2 * 10) + temp3)/10.0
if (neg):
temperature = -temperature
humidity = (hum1 * 10.0) + hum2
retStr = "class:sensor;protocol:oregon;model:F824;id:"  #14;temp:0.0;humidity:46;
retStr = '%s%d;temp:%1.1f;humidity:%d;'%(retStr,rollingcode,temperature,humidity)
return retStr


DISCOVERY_PORT = 30303
DISCOVERY_ADDRESS = '<broadcast>'
DISCOVERY_PAYLOAD = b"D"
DISCOVERY_TIMEOUT = timedelta(seconds=5)
sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_BROADCAST, 1)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock.settimeout(DISCOVERY_TIMEOUT.seconds)
sock.sendto(DISCOVERY_PAYLOAD, (DISCOVERY_ADDRESS, DISCOVERY_PORT))
data, (address, port) = sock.recvfrom(1024)
print data, address, port
time.sleep(1)
#fp = open("tellstick.data", "w")
print "listening..."
#UDPSock.sendto("A:disconnect", (address,42314)) #will reboot the Tellstick net
sock.sendto("B:reglistener", (address, 42314))
while 1:
try:
data,(address, port) = sock.recvfrom(10240)
print data
if (data.split(":")[6][6:10]=="F824"):
print decodeF824(data.split(":")[7][5:5+14])
#fp.write(data + '\n');
#fp.flush()
except KeyboardInterrupt:
print "done"
#fp.close()
break
except: # time out, try again
pass