of the subscription. A nice day! Go Shopping with me topic message.Mtqq_mosquittoMtqq_mosquittoIn addition to the Android side can send messages, of course, can also receive. Open another terminal and publish a message with the shopping topicmosquitto_pub -t shopping -m "Sorry,I have no time."You can see the Logcat in Android and show that you have received the corresponding message.Mtqq_mosquittoMtqq_mosquittoandroid Project DownloadHttps://github.com/djstava/MqttClientAndroidReference documen
,"Socket error:%s \a\n", Strerror (errno)); Exit (1); }//before calling the function connect, you need to specify the socket address of the server process//filling the SOCKADDR structureBzero (AMP;SERVER_ADDR,sizeof(structsockaddr_in)); Server_addr.sin_family=af_inet; Server_addr.sin_port=htons (portnumber);//server_addr.sin_addr= * (struct in_addr *) host->h_addr);//initiating a connection request establish a connection with the remote server if(Connect (SOCKFD,structSOCKADDR *) (AMP;SERVER_ADD
, "usage:%s hostname portnumber\a\n", argv[0]);Exit (1);}/* Client starts to build SOCKFD descriptor */if ((Sockfd=socket (af_inet,sock_stream,0)) ==-1){fprintf (stderr, "Socket error:%s\a\n", Strerror (errno));Exit (1);}/* Client program fills the data on the server */Bzero (server_addr,sizeof (SERVER_ADDR));Server_addr.sin_family=af_inet;Server_addr.sin_port=htons (PortNumber);server_addr.sin_addr=* (stru
In VirtualBox, sharing is relatively convenient if both the client and host are Windows. This is typically accessed through a path such as \\vboxsvr\shared.But if the client is Linux, it's a bit of a hassle (and it's good to know after you know it)First step: Install VirtualBox additioanl ToolsStep two: Set up a shared directoryStep three: Create a special device
Ubuntu 14.04 + Mutt + Msmtp configure the command line mail client in Linux
Install msmtp mutt in Ubuntu 14.04
Apt-get install-y msmtp mutt
Configure msmtpAfter the installation is complete, configure msmtp first. The default configuration file varies with the operating system version and can be viewed through msmtp -- version.
# Msmtp -- versionMsmtp version 1.4.31Platform: x86_64-pc-
How to share disks between Linux client systems in VirtualBox
In this tutorial, let me show you how to share a disk between two Linux client systems in VirtualBox.
This tutorial is helpful for those who want to configure and play with GFS or clusters.
Is the standard interface of VirtualBox:
Use Virtualbox in Ubu
- up connection .found that the computer room network is not modified, meaning that there is no dial-up connection.OK, buy a wireless network card connected to the campus WiFi headquarters.Bought found Linux no driver (my good melon-_-Check a half-day drive module, each module according to a test, are useless.Finally consider ndiswrapper install Windows driver.Source download good, found archlinux default do not let use make (_make)For Ubuntu, install
Label: 2016-4-6 14:17:15Preparation before installation:1/install Boost library2/Install SCons programMethod One:$ git clone git://github.com/mongodb/mongo.git$ CD MONGO$ cat Docs/building.md$ scons.After a period of compilation, the server side and client of MongoDB can be generated, as well as the C + + client library.Method two: Compile with scons (to install the SCons program first)Download MONGO source
Get server macCopy codeThe Code is as follows:/**Obtain the MAC address source code of the NIC. Currently, Windows/LINUX systems are supported.Obtain the physical (MAC) Address of the machine Nic**/Class GetmacAddr {Var $ result = array (); // returns a string array with a MAC addressVar $ macAddr;/* Construct */Function _ construct ($ osType ){Switch (strtolower ($ osType )){Case "unix": break;Case "solaris": break;Case "aix": break;Case "
Oracle 11gThe clientLinuxThe configuration process is a little bit difficult, but as long as we configure step by step, there is nothing. This article describes how to configure the Oracle 11g client on Linux.
First download several compressed packages from OTN, for: http://www.oracle.com/technology/software/tech/oci/instantclient/index.html, And then according to your platform, choose a different download,
dependency packages in the installation information. Remember the names of these dependency packages and copy them out.
bitnami@linux:/var/cache/apt/archives$ sudo apt-get install mutt[sudo] password for bitnami: Reading package lists... DoneBuilding dependency tree Reading state information... DoneThe following extra packages will be installed: libgpgme11 libpth20 libtokyocabinet8Suggested packages: gpgsm urlview aspell ispell mixmasterThe f
You can use the mount command or add entry items to/etc/fstab. The entry items in/etc/fstab include an NFS mount type. The NFS file system name consists of the host name of the file and the path name of the mounted directory. The two parts are separated by colons. For example, computer1:/home/project indicates that a file system is attached to/home/project in computer1.
It is recommended that the client use the mount command to mount the file. The fol
, such as: the first record {name: "Xiaoming"}, the second record: {name: "Xiaoli", age:15}, which is not possible in the relational database. For MongoDB, Where: Collections is the collection of tables that are equivalent to relational databases, and document documents are equivalent to rows in a relational database. So that is to say, the data stored in a table in MongoDB can be non-defined type, etc. Let's take a look at some of the basic operations of MongoDB's own shell client.Let's take a
Work we use is the company set up a good environment, want to create a server at home to do some technical research, at this time will encounter a variety of problems, the most important thing is to the computer can connect the server, or nothing can be done, now we will solve the client and service-side connectivity issues:The first step: Get the tools you need.
VM Virtual Machines
DR3
FileZilla
Jdk
Tomcat
JSP Source code
Download pptp-1.7.2.tar.gzHttp://pptpclient.sourceforge.net/root user upload to linux host/tmp directoryUnzip installation: cd/tmptar xzf pptp-1.7.2.tar.gzcd pptp-1.7.2make make install change Configuration: 1. Change the dialing user information file cd/etc/pppvi chap-secrets # Secrets for authentication using CHAP # client server secret IP addresses ###### redhat-config-network will overwrite this part !
) this.width=650; "src=" Http://s3.51cto.com/wyfs02/M02/49/99/wKiom1QWZqPw4rwtAAGpwh8_ZZ0445.png "title=" Sam34-1. PNG "alt=" Wkiom1qwzqpw4rwtaagpwh8_zz0445.png "/>After the above configuration is complete, the Samba server will automatically complete the synchronization when the user modifies the system user password using passwd, but if the new user on the system must first use SMBPASSWD-A to add the user to the Samba server before using passwd to set the user's system password , or you will n
environment. because you do not have an Oracle database installed locally, you need to get three files from the directory where you installed the Oracle database. [Email protected] admin]# Lslistener.ora Sqlnet.ora Tnsnames.ora//For these three files, put it in the/home/oracle/oracleclient directory 6. Edit three files VI Tnsnames.ora Bossdata = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP) (HOST =172.16.0.73) (PORT = 1521))// 172.16.0.73 IP Address, port number: 1521 (Connect_data = (SERVER = d
/directory back to the root user, and the MySQL user only needs to be the owner of all files in the Mysql/data directory.[Email protected]/usr/local/mysql]# chown-r root.[[email protected]/usr/local/mysql]# chown-r mysql data.6. Copy the configuration file to/etc/my.cnf[email protected]/usr/local/mysql]# CP support-files/my-medium.cnf/etc/my.cnf7. Add the MYSQLD service to the boot entry.A. Copy the Scripts/mysql.server service script to/ETC/INIT.D and rename it to Mysqld[email protected]/usr/lo
I reviewed the Linux socket programming, wrote the simplest server and client programs, and passed the test. The server-side programs adopt the loop and busy waiting mechanism, which will be changed to multithreading and thread pool mechanism later.
Server programs
#include
Client Program
#include
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