See who is connected to the same network / WIFI

Posted on October 11, 2015 by tobias

There are tools out there, such as Angry IP Scanner, iNet or IP Scanner, Â but this can easily be done using a bash script, not as nice looking perhaps but it does the job.

The script :

#!/bin/bash
for i in {0..255}
do
	cmd="nslookup 192.168.1."
	cmd=$cmd$i
	result=$($cmd|egrep "Address|name")
	echo "****************"
	echo $cmd
	echo $result
done

#!/bin/bash

for i in {0..255}

cmd="nslookup 192.168.1."

cmd=$cmd$i

result=$($cmd|egrep "Address|name")

echo "****************"

echo $cmd

echo $result

done

Which should give you an output that looks like this

****************
nslookup 192.168.1.84
Address: 192.168.1.254#53
****************
nslookup 192.168.1.85
Address: 192.168.1.254#53
****************
nslookup 192.168.1.86
Address: 192.168.1.254#53 86.1.168.192.in-addr.arpa name = Tobiass-iMac.lan.
****************
nslookup 192.168.1.87
Address: 192.168.1.254#53 87.1.168.192.in-addr.arpa name = raspberrypi.lan.
****************
nslookup 192.168.1.88
Address: 192.168.1.254#53 88.1.168.192.in-addr.arpa name = Lindas-iPad.lan.
****************
nslookup 192.168.1.89
Address: 192.168.1.254#53
****************

****************

nslookup 192.168.1.84

Address: 192.168.1.254#53

****************

nslookup 192.168.1.85

Address: 192.168.1.254#53

****************

nslookup 192.168.1.86

Address: 192.168.1.254#53 86.1.168.192.in-addr.arpa name = Tobiass-iMac.lan.

****************

nslookup 192.168.1.87

Address: 192.168.1.254#53 87.1.168.192.in-addr.arpa name = raspberrypi.lan.

****************

nslookup 192.168.1.88

Address: 192.168.1.254#53 88.1.168.192.in-addr.arpa name = Lindas-iPad.lan.

****************

nslookup 192.168.1.89

Address: 192.168.1.254#53

****************

That’s it

-Tobias

Ã–vervakning av min IVT-490 vÃ¤rmepump med Raspberry Pi

Posted on March 8, 2015 by tobias

I denna artikeln ska jag fÃ¶rsÃ¶ka beskriva mitt lilla projekt med att Ã¶vervaka min IVT-490 vÃ¤rmepump med en Raspberry P.

Jag har hÃ¤mtat mycket kunskap frÃ¥n dessa tvÃ¥ forum-trÃ¥dar :
http://www.varmepumpsforum.com/vpforum/index.php?topic=27306.15Tanken
och
http://www.byggahus.se/forum/varme-allmant/44487-prata-med-ivt-490-a-5.html

Min vÃ¤rmepump har ett interface som ser ut sÃ¥hÃ¤r :

Man behÃ¶ver slÃ¥ pÃ¥ variabeldumpning pÃ¥ pannan fÃ¶r att fÃ¥ ut information. Man kommer in i Admin mode genom att hÃ¥lla in hÃ¶gra knappen i 5-10 sekunder. Sedan letar man upp “Installation och igÃ¥ngkÃ¶rning” och dÃ¤r finner man “Variabeldumpning till PC”. Med det pÃ¥slaget sÃ¥ fÃ¥r man ut data 1 gÃ¥ng per minut. (source; Niclas Hedlund)

CiterarÂ Niclas.HedlundÂ om interfacet frÃ¥n VÃ¤rmepumpsforum:

Baudraten Ã¤r 9600baud och 8 databitar, 1stopbit och ingen paritet.
TÃ¤nk pÃ¥ att TxD som Ã¤r markerat pÃ¥ bilden Ã¤r data UT frÃ¥n pumpen, och RxD data IN till pumpen.

DÃ¥ jag inte lyckats fÃ¥ tag pÃ¥ en kontakt sÃ¥ fick jag anvÃ¤nda mig av en plastpÃ¥seklÃ¤mma (som man kÃ¶per pÃ¥ MAXI) som jag vÃ¤nt pÃ¥ och satt tvÃ¥ skruvar i, och sÃ¥ har jag silvertejp ocksÃ¥…. ja ja det Ã¤r ju pÃ¥ egen risk 🙂

EDIT: Nu funkade inte min plastklÃ¤mma sÃ¥ bra sÃ¥ jag lÃ¶dde dit trÃ¥darna istÃ¤llet, nu funkar det bÃ¤ttre. MEN sÃ¥ hÃ¶rde Fredrik Winkvist av sig och berÃ¤ttade vilken kontakt man skulle ha, och den ska funka perfekt. FÃ¶r er som sÃ¶ker sÃ¥ heter den “2.54mm Pitch 2×5 Pin Double Row Angle IDC Pin Headers 10 Pins”. Ett stort Tack till Fredrik, hÃ¤r Ã¤r en lÃ¤nk till eBay som sÃ¤kert blir outdated men sÃ¥ lÃ¤nge den finns kvar kan lÃ¤nkenÂ vara bra:Â http://www.ebay.com/itm/20-Pcs-2-54mm-Pitch-2×5-Pin-Double-Row-Angle-IDC-Pin-Headers-10-Pins-/310784076520?pt=LH_DefaultDomain_0&hash=item485c2caae8

Specification:

Product Name	IDC Pin Header
Position	5
Pin Number	10
Row	2
Mounting Angle	90 Degree
Pin Pitch	2.54mm/0.1″
Pin Length	4mm/ 0.16″Â Â Â Â 12mm/ 0.47″
Total Size	19 x 9.5 x 22mm/ 0.75″ x 0.37″ x 0.87″ ( LWH)
Material	Plastic, Metal
Color	Black, Silver Tone
Net Weight	66g
Package Content	20 x Angle IDC Pin Headers

Description:

Features double row, 90 degree mounting angle, male pin header, electronic component, IDC connector.

This pin header is an ideal connector for the PCB board and intergrated circuit, used widely in the computer, breadboard, LCD, TV and other home appliances.

NÃ¤r detta var gjort var jag tvungen att koppla in det via typ USB, sÃ¥ jag kÃ¶pte en sÃ¥dan

hÃ¤rÂ pÃ¥ ebay.Â http://www.ebay.co.uk/itm/6PIN-CP2102-USB-2-0-to-UART-TTL-Electronic-Connector-Serial-Converter-Module-/390568169609?pt=UK_Computing_Parallel_Serial_PS_2&hash=item5aefad5089
Varje minut sÃ¥ skickar den ut 37-parametrar som Ã¤r ;-separerade, se EXCEL filen;Â Loggning-2. (loggfilen kommer ocksÃ¥ frÃ¥n VÃ¤rmepumpsforumet; inskickat avÂ Larsmaja)

En rad kan se ut sÃ¥hÃ¤r :

360; Â  315;Â  Â  33; Â  478; Â  445; Â  447;Â  -512; Â  774;Â  -512;0;0;0;0;1;0;0;1;1;0;0; Â  296; Â  311; Â  326; Â  341; Â  495; Â  520; Â  545; Â  301; Â  326; Â  351; Â  435; Â  105;Â  Â  26; Â  Â  0; Â  Â  0; Â  Â  0; Â  Â  0

1	360; Â 315;Â Â 33; Â 478; Â 445; Â 447;Â -512; Â 774;Â -512;0;0;0;0;1;0;0;1;1;0;0; Â 296; Â 311; Â 326; Â 341; Â 495; Â 520; Â 545; Â 301; Â 326; Â 351; Â 435; Â 105;Â Â 26; Â Â 0; Â Â 0; Â Â 0; Â Â 0

DÃ¤r alla temperaturer Ã¤r heltal med 1 decimals noggrannhet, sÃ¥ 315 betyder 31,5 grader Celsius.
360 Ã¤r sekvensummer
315 Ã¤r Framledningstemperatur (GT1), dvs 31,5 grader
33 Ã¤r Utetemperatur (GT2), dvs 3,1 grader
478 Ã¤r Tapvarmvatten (GT3-1), dvs 47,8 grader
445 Ã¤r Varmvatten(GT3-2), dvs 44,5 grader
447 Ã¤r VÃ¤rmevatten(GT3-3), dvs 44,7 grader
-512 Ã¤r Rumstemperatur(GT5), men jag har inte den givaren sÃ¥ den visar -512
774 Ã¤r Hetgastemperatur(GT6), dvs 77,4 grader

I bilden nedan ser man de olika givarna GT1-7.

PÃ¥ min Raspberry pi skrev jag ett enkelt script som lÃ¤ser frÃ¥n USB-serieporten och postar pÃ¥ en websida som jag har gjort, dÃ¤r jag helt enkelt lÃ¤gger in det i en MySQL databas )oerhÃ¶rt enkelt, bara timestamp och sÃ¥ det ;-separerade datan (tvÃ¥ kolumner, pga av att jag ville komma igÃ¥ng, skulle sÃ¥klart haft 38 kolumner sÃ¥ man kunde gÃ¶ra lite mer SQL, men det fÃ¥r bli en annan gÃ¥ng…)

import requests
import serial
import time
from time import gmtime, strftime
import re

pattern = re.compile(r'\s+')

def readlineCR(port):
	rv = ""
	while True:
		ch = port.read()
		rv += ch
		if ch == '\r' or ch == '':
			return rv

def post(timestamp,data) :
	payload = {'timestamp': timestamp, 'data': data}
	try :
		r = requests.post("http://domain.com/path/file.php", data=payload)
		print(r.text)
	except Exception as e:
		print "Oops! unable to post result!",e.__doc__,e.message


port = serial.Serial("/dev/ttyUSB0", baudrate = 9600, timeout = 60)

while True: 
	rcv=''
	try :
		rcv = readlineCR(port)
	except Exception as e:
		print "Oops! problems reading from USB!"
		print e.__doc__
		print e.message
	rcv = re.sub(pattern, '',rcv)
	timeStamp = strftime("%Y-%m-%d %H:%M:%S", gmtime())
	print(timeStamp+rcv)
	if rcv :
		post( timeStamp,rcv)
	else :
		print "Empty data..."

import requests

import serial

import time

from time import gmtime, strftime

import re

pattern = re.compile(r'\s+')

def readlineCR(port):

rv = ""

while True:

ch = port.read()

rv += ch

if ch == '\r' or ch == '':

return rv

def post(timestamp,data) :

payload = {'timestamp': timestamp, 'data': data}

try :

r = requests.post("http://domain.com/path/file.php", data=payload)

print(r.text)

except Exception as e:

print "Oops! unable to post result!",e.__doc__,e.message

port = serial.Serial("/dev/ttyUSB0", baudrate = 9600, timeout = 60)

while True:

rcv=''

try :

rcv = readlineCR(port)

except Exception as e:

print "Oops! problems reading from USB!"

print e.__doc__

print e.message

rcv = re.sub(pattern, '',rcv)

timeStamp = strftime("%Y-%m-%d %H:%M:%S", gmtime())

print(timeStamp+rcv)

if rcv :

post( timeStamp,rcv)

else :

print "Empty data..."

Jag har noterat att ibland sÃ¥ ramlar mina trÃ¥dar ur, och sÃ¥ fÃ¥r jag inget resultat, dÃ¥ blir serieporten inte nÃ¥barÂ 🙂 och dÃ¥ fÃ¥r jag lite roliga felutskrifter… och sÃ¥klart blir diagrammen dÃ¥ligt uppdaterade….

Jag har gjort en websida (PHP and Javascript) dÃ¤r jag anvÃ¤nt Highcharrts fÃ¶r att rendera diagrammen. Ta en titt hÃ¤rÂ http://tsoft.se/varmepanna/

Fredrik Winkvist var dessutom lite uppfinningsrik och berÃ¤ttade att man anvÃ¤nda strÃ¶mfÃ¶rsÃ¶rjningen frÃ¥n vÃ¤rmepumpens 5Volt ut till Raspberry Pi;n. Ta en kik pÃ¥ bilden nedan.

FÃ¶rbÃ¤ttringsfÃ¶rslag Ã¤r alltid vÃ¤lkomna, sÃ¥ hÃ¶r av er !

Mitt nÃ¤sta projekt, nÃ¤r jag fÃ¥r tid…. Ã¤r att mÃ¤ta strÃ¶mfÃ¶rbrukningen hemma…

-Tobias

Calculate the minimum waste when cutting planks…

Posted on July 10, 2014 by tobias

I made a web application which will calculate the most optimum layout of your pieces you would like to cut from a plank. This helps in figuring out how many planks of a certain size you would have to buy, and also gives you which pieces should be cut out on each plank.

Not sure how many times I have been sitting there, trying to figure out how many to buy, and now I simply thought that a small web-app would be nice. In fact I tried to google this, but it turns out that most people say stuff like, well add 10-15% to the total length, but that just does not work for me, that is way to inaccurate.

This page is currently in Swedish only, but until it has been translated, I bet you will understand anyway, the user interface is pretty easy to use (should not require any translation I think)…

anyway, here is the link; spill.tsoft.se

Enjoy!

-Tobias

DTrace;ing the JVM, useful tips

Posted on October 5, 2013 by tobias

I am using DTrace from time to time and it is really nice, you can do a lot with it.

This page is mostly a reminder to myself cause there are tons of pages out there if you google it, but I figured that why not share the knowledge 🙂

List all Probes available in a process

# <strong>dtrace -ln 'pid$target:::entry' -p 809</strong>
   ID   PROVIDER            MODULE                          FUNCTION NAME
62650     pid809              bash                             __fsr entry
62651     pid809              bash                              main entry
62652     pid809              bash                        exit_shell entry
62653     pid809              bash                           sh_exit entry
62654     pid809              bash               shell_is_restricted entry
[...6778 lines truncated...]

# <strong>dtrace -ln 'pid$target:::entry' -p 809</strong>

ID PROVIDER MODULE FUNCTION NAME

62650 pid809 bash __fsr entry

62651 pid809 bash main entry

62652 pid809 bash exit_shell entry

62653 pid809 bash sh_exit entry

62654 pid809 bash shell_is_restricted entry

[...6778 lines truncated...]

Â List all probes that has to do with the JAVA JVM Hotspot

dtrace -l | grep hotspot

Figure out WHO initiated the Garbage Collection (GC)

dtrace -n ‘hotspot$target:::gc-begin { jstack(); }’ -p 25736

dtrace: description 'hotspot$target:::gc-begin ' matched 4 probes
CPU ID FUNCTION:NAME 
0 54737 __1cRVM_GenCollectFullEdoit6M_v_:gc-begin 
libjvm.so`__1cRVM_GenCollectFullEdoit6M_v_+0x24 
libjvm.so`__1cMVM_OperationIevaluate6M_v_+0x79 
libjvm.so`__1cIVMThreadDrun6M_v_+0x548 
libjvm.so`java_start+0x9d2 
libc.so.1`_thr_setup+0x5b 
libc.so.1`_lwp_start

dtrace: description 'hotspot$target:::gc-begin ' matched 4 probes

CPU ID FUNCTION:NAME

0 54737 __1cRVM_GenCollectFullEdoit6M_v_:gc-begin

libjvm.so`__1cRVM_GenCollectFullEdoit6M_v_+0x24

libjvm.so`__1cMVM_OperationIevaluate6M_v_+0x79

libjvm.so`__1cIVMThreadDrun6M_v_+0x548

libjvm.so`java_start+0x9d2

libc.so.1`_thr_setup+0x5b

libc.so.1`_lwp_start

JVM Probes

http://docs.oracle.com/javase/6/docs/technotes/guides/vm/dtrace.html

Figure out what objects are being allocated using DTrace

http://prefetch.net/blog/index.php/2007/10/31/using-the-dtrace-hotspot-provider-to-observe-java-object-allocations/

JVM: Unable to open door

$ <b>jinfo -flag +ExtendedDTraceProbes `pgrep java`</b>
 590: Unable to open door: target process not responding or HotSpot VM not loaded

1 2	$ <b>jinfo -flag +ExtendedDTraceProbes `pgrep java`</b> 590: Unable to open door: target process not responding or HotSpot VM not loaded

The jinfo command needs to be run by the user the JVM runs as.

Printopia a great AirPrinter server for your USB printer

Posted on August 1, 2013 by tobias

I have recently starting to use Printopia on my iMac, it makes it possible to use my USB printer connected to my iMac as a AirPrinter, and thus I am able to print from my iPhone or iPad. What a brilliant tool !

Price was 19 USD, which I can live with…

http://www.ecamm.com/mac/printopia/

Me and my son off for a short trip with the bike

Posted on July 14, 2013 by tobias

This is me and my son taking a ride, we have only been out for a couple of times, but he likes it, and I like it a lot !!!

tsoft.se

Tobias – With a Passion For Software Development

Author Archives: tobias

See who is connected to the same network / WIFI

Ã–vervakning av min IVT-490 vÃ¤rmepump med Raspberry Pi

Calculate the minimum waste when cutting planks…

DTrace;ing the JVM, useful tips

Â List all probes that has to do with the JAVA JVM Hotspot

Figure out WHO initiated the Garbage Collection (GC)

JVM Probes

Figure out what objects are being allocated using DTrace

JVM: Unable to open door

Printopia a great AirPrinter server for your USB printer

Me and my son off for a short trip with the bike