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  • Arduino Ethernet Shield Not Connecting to WebServer

    - by new user
    I have a problem making my Arduino Ethernet shield to communicate with the server, the result on the serial monitor is always: my arduino code is #include <Ethernet.h> //library for ethernet functions #include <SPI.h> #include <Dns.h> #include <Client.h> //library for client functions #include <DallasTemperature.h> //library for temperature sensors // Ethernet settings byte mac[] = {0x09,0xA2,0xDA,0x00,0x01,0x26}; //Replace with your Ethernet shield MAC byte ip[] = { 192,168,0,54}; //The Arduino device IP address byte subnet[] = { 255,255,255,0}; byte gateway[] = { 192,168,0,1}; IPAddress server(192,168,0,53); // IP-adress of server arduino sends data to EthernetClient client; bool connected = false; void setup(void) { Serial.begin(9600); Serial.println("Initializing Ethernet."); delay(1000); Ethernet.begin(mac, ip , gateway , subnet); } void loop(void) { if(!connected) { Serial.println("Not connected"); if (client.connect(server, 80)) { connected = true; int temp =analogRead(A1); Serial.print("Temp is "); Serial.println(temp); Serial.println(); Serial.println("Sending to Server: "); client.print("GET /formSubmit.php?t0="); Serial.print("GET /formSubmit.php?t0="); client.print(temp); Serial.print(temp); client.println(" HTTP/1.1"); Serial.println(" HTTP/1.1"); client.println("Host: http://localhost/PhpProject1/"); Serial.println("Host: http://localhost/PhpProject1/"); client.println("User-Agent: Arduino"); Serial.println("User-Agent: Arduino"); client.println("Accept: text/html"); Serial.println("Accept: text/html"); //client.println("Connection: close"); //Serial.println("Connection: close"); client.println(); Serial.println(); delay(10000); } else{ Serial.println("Cannot connect to Server"); } } else { delay(1000); while (client.connected() && client.available()) { char c = client.read(); Serial.print(c); } Serial.println(); client.stop(); connected = false; } } the server is an Apache server running on a pc, the server ip address in the code is the pc ip address. For testing purposes I work at my homes network, there's no proxy or firewall, and I also turned of the antivirus and firewall on my pc. the result in the serial monitor is always: Not connected Cannot connect to Server Any thoughts??

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  • Core Data object into an NSDictionary with possible nil objects

    - by Chuck
    I have a core data object that has a bunch of optional values. I'm pushing a table view controller and passing it a reference to the object so I can display its contents in a table view. Because I want the table view displayed a specific way, I am storing the values from the core data object into an array of dictionaries then using the array to populate the table view. This works great, and I got editing and saving working properly. (i'm not using a fetched results controller because I don't have anything to sort on) The issue with my current code is that if one of the items in the object is missing, then I end up trying to put nil into the dictionary, which won't work. I'm looking for a clean way to handle this, I could do the following, but I can't help but feeling like there's a better way. *passedEntry is the core data object handed to the view controller when it is pushed, lets say it contains firstName, lastName, and age, all optional. if ([passedEntry firstName] != nil) { [dictionary setObject:[passedEntry firstName] forKey:@"firstName"] } else { [dictionary setObject:@"" forKey:@"firstName"] } And so on. This works, but it feels kludgy, especially if I end up adding more items to the core data object down the road.

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  • using jquery $.ajax to retrieve data and push data into javascript array through the success functio

    - by teamdane
    Hello All, I have a function that I'm trying to retrieve values using $.ajax and push the returned data into an array called output. Problem is the success function will not allow me to push the results into the array. see below for code. var getValues = function(el) { var value = ($(el).val()); if(value == '' || $(el).attr('disabled')) { return []; } var string = 'value=' + value; var output = []; $.ajax({ type: "GET", url: 'shocklookup_callback.php', dataType: "string", data: string, success: function(data) { } }); //output.push({ text : value + 'test', value : value + 'test1'} ); return output; }; Any ideas of what I can put in the success function to be able to push the data into the output array? Also I need to be able to return the output array to the original function getValues. If this doesn't' make a whole lot of sense please let me know and I'll try to explain better. Thanks, Dane

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  • How to reduce a data frame keeping the order for other columns

    - by betabandido
    I am trying to reduce a data frame using the max function on a given column. I would like to preserve other columns but keeping the values from the same rows where each maximum value was selected. An example will make this explanation easier. Let us assume we have the following data frame: dframe <- data.frame(list(BENCH=sort(rep(letters[1:4], 4)), CFG=rep(1:4, 4), VALUE=runif(4 * 4) )) This gives me: BENCH CFG VALUE 1 a 1 0.98828096 2 a 2 0.19630597 3 a 3 0.83539540 4 a 4 0.90988296 5 b 1 0.01191147 6 b 2 0.35164194 7 b 3 0.55094787 8 b 4 0.20744004 9 c 1 0.49864470 10 c 2 0.77845408 11 c 3 0.25278871 12 c 4 0.23440847 13 d 1 0.29795494 14 d 2 0.91766057 15 d 3 0.68044728 16 d 4 0.18448748 Now, I want to reduce the data in order to select the maximum VALUE for each different BENCH: aggregate(VALUE ~ BENCH, dframe, FUN=max) This gives me the expected result: BENCH VALUE 1 a 0.9882810 2 b 0.5509479 3 c 0.7784541 4 d 0.9176606 Next, I tried to preserve other columns: aggregate(cbind(VALUE, CFG) ~ BENCH, dframe, FUN=max) This reduction returns: BENCH VALUE CFG 1 a 0.9882810 4 2 b 0.5509479 4 3 c 0.7784541 4 4 d 0.9176606 4 Both VALUE and CFG are reduced using max function. But this is not what I want. For instance, in this example I would like to obtain: BENCH VALUE CFG 1 a 0.9882810 1 2 b 0.5509479 3 3 c 0.7784541 2 4 d 0.9176606 2 where CFG is not reduced, but it just keeps the value associated to the maximum VALUE for each different BENCH. How could I change my reduction in order to obtain the last result shown?

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  • Core Data Errors vs Exceptions Part 3

    - by John Gallagher
    My question is similar to this one. Background I'm creating a large number of objects in a core data store using NSOperations to speed things up. I've followed all the Core Data multithreading rules - I've got a single persistent store coordinator and a managed object context per thread that on save is merging back to the main managed object context. The Problem When the number of threads running at once is more than 1, I get the exception logged on save of my core data store: NSExceptionHandler has recorded the following exception: NSInternalInconsistencyException -- optimistic locking failure What I've Tried My code that creates new entities is quite complex - it makes entities that have relationships with other entities that could be being created in a separate thread. If I replace my object creation routine with some very simple code just making non-related entries, everything works perfectly. Initially, as well as the exceptions, I was getting a save error saying core data couldn't save due to the merge failing. I read the docs and realised I needed a merge policy on the Managed Object Context I was saving to. I set this up and as this question states, the save error goes away, but the exception remains. My Question Do I need to worry about these exceptions? If I do need to get rid of the exceptions, any ideas on how I do it?

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  • Quickly generate junk data of certain size in Javascript

    - by user1357607
    I am writing an upload speed test in Javascript. I am using Jquery (and Ajax) to send chunks of data to a server in order to time how long it takes to get a response. This should, in theory give an estimation, of the upload speed. Of course to cater for different bandwidths of the user I sequentially upload larger and larger amounts of junk data until a threshold duration is reached. Currently I generate the junk data using the following function, however, it is very slow when generation megabytes of data. function generate_random_data(size){ var chars = "abcdefghijklmnopqrstuvwxyz"; var random_data = ""; for (var i = 0; i < size; i++){ var random_num = Math.floor(Math.random() * char.length); random_data = random_data + chars.substring(random_num,random_num+1); } return random_data; Really all I am doing is generating a chunk of bytes to send to the server, however, this is the only way I could find out how in Javascript. Any help would be appreciated.

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  • Data transformation question

    - by tkm
    I have data composed of a list of employers and a list of workers. Each has a many-to-many relationship with the other (so an employer can have many workers, and a worker can have many employers). The way the data is retrieved (and given to me) is as follows: each employer has an array of workers. In other words: employer n has: worker x, worker y etc. So I have a bunch of employer objects each containing an array of workers. I need to transform this data (and basically invert the relationship). I need to have a bunch of worker objects, each containing and array of employers. In other words: worker x has: employer n1, employer n2 etc. The context is hypothetical so please don't comment on why I need this or why I am doing it this way. I would really just like help on the algorithm to perform this transformation (there isn't that much data so I would prefer readability over complex optimizations which reduce complexity). (Oh and I am using Java, but pseudocode would be fine). Thanks!

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  • Browser connects to WCF service but not my WCF client. What can be the reason?

    - by Slauma
    On a production server (Windows Server 2003 SP2) I can connect to a remote WCF service with Internet Explorer 8: When I browse to the URL http://www.domain.com/Service.svc (where my service listens) I get the expected info page of the service displayed. Connection settings in Internet Explorer only specify "auto detect", proxy settings are disabled. If I start a console application (built with WCF in .NET 4.0) on the same server which also tries to connect to the same WCF service it fails telling me that no endpoint was available listening on http://www.domain.com/Service.svc. Configuration of the WCF client: <configuration> <system.serviceModel> <bindings> <wsHttpBinding> <binding name="WSHttpBinding_IMyService" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00" bypassProxyOnLocal="false" transactionFlow="false" hostNameComparisonMode="StrongWildcard" maxBufferPoolSize="524288" maxReceivedMessageSize="65536" messageEncoding="Text" textEncoding="utf-8" useDefaultWebProxy="true" allowCookies="false"> <readerQuotas maxDepth="32" maxStringContentLength="8192" maxArrayLength="16384" maxBytesPerRead="4096" maxNameTableCharCount="16384" /> <reliableSession ordered="true" inactivityTimeout="00:10:00" enabled="false" /> <security mode="None"> <transport clientCredentialType="Windows" proxyCredentialType="None" realm="" /> <message clientCredentialType="Windows" negotiateServiceCredential="true"/> </security> </binding> </wsHttpBinding> </bindings> <client> <endpoint address="http://www.domain.com/Service.scv" binding="wsHttpBinding" bindingConfiguration="WSHttpBinding_IMyService" contract="Service.IMyService" name="WSHttpBinding_IMyService" /> </client> </system.serviceModel> <configuration> With these settings I can communicate successfully with the remote service from my development machine. Looking around for other options I found that I can specify to use the Internet Explorer proxy settings with: <system.net> <defaultProxy> <proxy usesystemdefault="true" /> </defaultProxy> </system.net> It didn't work and I am not sure if I understood this setting really correctly. (My hope was that the WCF client will adopt the "autodetect" setting of Internet Explorer and then connect the same way to the service like the installed IE.) I also had toggled the useDefaultWebProxy setting in the binding configuration between true and false with no success. Now I am asking for help what I can do? Which settings might be wrong or missing? What could I test and how can I get more detailed error messages to better identify the problem? Thank you in advance!

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  • Does each authenticated WCF client connection need a CAL?

    - by Sentax
    Just like the title says. Does each authenticated WCF client connection to a WCF server that you have developed need a windows CAL? http://www.microsoft.com/windowsserver2008/en/us/client-licensing.aspx Microsoft's licensing on that page sure makes it sound like it, but I can't find anything out there that confirms, or even denies this. Anyone know?

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  • Cloud computing over Client-server: differences, cons and pros ?

    - by Vimvq1987
    As far as I know, Cloud computing might be a evolution in software architect, and it will replace some current architectures, such as client-server. These two architecture seem to share similarities for me (I know very little about both), but I don't know the differences between them. What are the cons and pros of cloud computing over client-server architecture? Thank you so much.

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  • What's the best SOAP client library for Python, and where is the documentation for it?

    - by blackrobot
    I've never used SOAP before and I'm sort of new to Python. I'm doing this to get myself acquainted with both technologies. I've installed SOAPlib and I've tried to read their Client documentation, but I don't understand it too well. Is there anything else I can look into which is more suited for being a SOAP Client library for Python? Edit: Just in case it helps, I'm using Python 2.6.

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  • How to develop a client-server seat booking program via java socket programming ?

    - by Haxed
    I have a project to develop a client server application in java. This is to be done using socket programming. Our lecturer, used 2 files, the TCPClient.java and TCPServer.java, to make a connection and we typed "Hi" in the client and the server displayed that message. I need to develop a seat booking application. Any suggestions for tutorials or tips or a book perhaps would be nice. Many Thanks

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  • Win Server 2k and Win 7 client

    - by Ray Kruse
    I have a Win Server 2000 system with AD configured. The network consists of an OKI printer, a network server, a wifi router a Win 2k client and the server. I'm trying to connect a Win 7 client. The purpose of the network, besides sharing equipment is to move files from client to client and scatter backups over more than 1 machine. The Win 7 client is configured for DHCP and does in fact receive it's IP and DNS configuration from the server and it sees the printer, wifi router and network drive, but does not see the Win 2k client nor the Win 2k server. I have tried the LAN Management Authentication Level set to 'Send LM & NTLM responses' with the 128 bit encryption removed. I've also done the registry hack on the key 'LmCompatibilityLevel'. Neither of these have helped. I have two questions: Is there a fix or is Win 2k totally incompatible? Is the best (or quickest/cheapest) fix to upgrade the server to Win 2k3 and not worry about the Win 2k client? Thanks for any help. Ray Kruse Buffalo, KY

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  • use SVN @ client end and CM synergy @ server side

    - by Ravisha
    We are using CM synergy client as version control,but we find it very complicated.We are mostly biased with SVN client tool.Is there a way to configure svn at client end but maintain CM synergy @ server side.This would help us a lot ,bcos merging and conflict resolution is very simple in SVN.I do not know where to go about this solution,any initial help will be very helpful CM synergy www.windriver.com/cgi-bin/partnerships/directory/viewProd.cgi?id=1451 SVN tortoisesvn.tigris.org/

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  • Log website performance client side.

    - by NitroxDM
    I have a client that is have an issue (it's slow) with a website on one of my servers. The server is a windows 2003 box running WebSphere 6.1. I can't find anything in the logs that would indicates an issue. Is there some free software out there that can help me figure out why the site is slow on the client's end? The client has an IT department, but I need to be sure it's not my side of things.

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  • Force Juniper-network client to use split routing

    - by craibuc
    I'm using the Juniper client for OSX ('Network Connect') to access a client's VPN. It appears that the client is configured to not use split-routing. The client's VPN host is not willing to enable split-routing. Is there a way for me to over-ride this configuration or do sometime on my workstation to get the non-client network traffic to by-pass the VPN? This wouldn't be a big deal, but none of my streaming radio stations (e.g. XM) work will connected to their VPN. Apologies for any inaccuracies in the terminology. ** edit ** The Juniper client changes my system's resolve.conf file from: nameserver 192.168.0.1 to: search XXX.com [redacted] nameserver 10.30.16.140 nameserver 10.30.8.140 I've attempted to restore my preferred DNS entry to the file $ sudo echo "nameserver 192.168.0.1" >> /etc/resolv.conf but this results in the following error: -bash: /etc/resolv.conf: Permission denied How does the super-user account not have access to this file? Is there a way to prevent the Juniper client from making changes to this file?

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  • Is adding users to the group www-data safe on Debian?

    - by John
    Many PHP applications do self-configuration and self-updating. This requires apache to have write access to the PHP files. While chgrp'ing them all to www-data appears like a good practice to avoid making them world writable, I also wish to allow users to create new files and edit existing one. Is adding users to the group www-data safe on Debian? For example: 775 root www-data /var/www 644 john www-data /var/www/johns_php_application.php 660 john www-data /var/www/johns_php_applications_configuration_file

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  • Server-side SSH jump hosts

    - by Dan Sosedoff
    Trying to figure out server side SSH jump hosts logic. Current network schema: [Client] <--> [Server A: hostname: a.com] <--> [Server B] [Client] <--> [Server A: hostname: b.com] <--> [Server C] Server A responds to both DNS records. Possible flow: Client opens a ssh connection with ssh [email protected]. Server A accepts it and should automatically jump user onto Server B with ssh user2@server_b.com. Client opens a ssh connection with ssh [email protected]. Server A accepts it and should automatically just user onto Server C with ssh user2@server_c.com. In other words, client should be able to connect to the target without performing any local configuration, assuming that we have a stock ssh config. The problem with ssh jumps is that user has to define hosts in local ~/.ssh/config file, which is not acceptable in my case. It needs to be a default sshd behavior. Im aware that you can define a custom command ~/.ssh/authorized_keys on server, but i dont think there is a way to properly detect source hostname where user tries to connect. It is possible at all ?

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