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USB communication protocol--in-depth understanding 0. Basic conceptsA "Transmission" (Control, batch, interrupt, etc.): consists of multiple "transactions";A "Transaction" (in, Out, SETUP): consists of one or more "Packet".The USB data is transmitted between the host software and the USB device-specific endpoint. The association between "host software" and "USB device-specific endpoint" is called "pipes". A
(1) SDP description format(2) SDP example(3) SDP(1) SDP description formatM=video 1234 RTP/AVP 96a=rtpmap:96 H264A=framerate:15C=in IP4 192.168.0.104Above is a self-written RTPM=audio 1234 RTP/AVP 0a=rtpmap:0 PCMA/8000/1A=framerate:25C=in IP4 172.18.168.451.m= is the beginning of a media-level session, Audio: media type; 1234: port number; RTP/AVP: transport protocol; Payload format in 0:RTP header2.a=rtpmap: proof is a further description of dynamic
as follows:If the value of cursor ID is 0, no cursor is available, that is, other data cannot be obtained through cursor.
In fact, through the above experimental results, we have a general understanding of the communication protocol of the MongoDB client server, for more details, see the MongoDB official documentation (Mongo wire Protocal)
Summary:1. batchsize indicates the number of records returned by th
This article mainly introduces how to solve the problem of communication between the parent page and the iframe page through pseudo-Protocol. For more information, see the operations on the parent page and the iframe page. For example:
The content in this iframe is written in js. As shown in the following code:
var iframe = document.getElementById("iframe"), doc = iframe.contentWindow.document;doc.open(
This article mainly introduces how to solve the problem of communication between the parent page and the iframe page through pseudo-protocol. For more information, see the operations on the parent page and the iframe page. for example:
The content in this iframe is written in js. As shown in the following code:
var iframe = document.getElementById("iframe"), doc = iframe.contentWindow.document;doc.open(
immediately reply to the middleware Socket Server message format is "Command_result" + ":" + Processed request content (appended format) middleware socket server received a message to modify the results of this request to execute successfully, thus completing a complete operationJSON format with request content:api_request:{"$id": "1", "RequestID": "066a395a-486f-4e93-b782-fbf889e1d52f", "Token": null, "RequestData": "11| Deposit "," Resultdata ":" {\ "cellno\": \ "\", \ "resultmessage\": \ "Mi
are high levels. 2. Start condition (S): When the SCL is high, SDA jumps from high to low to start transmitting data.3. End condition (P): When the SCL is low, SDA jumps from low to high, ending the transfer of data. 4. Data valid: During high SCL, SDA remains stable, data is valid, and SDA changes occur only during SCL low.5. ACK signal: In the process of data transmission, the receiving device receives one byte of data each, to produce an ACK signal, send a specific low level pulse to the tra
I. 802.11 protocol-wifi-comparisonTwo. 802.11n Physical layer Technology Ofdm-mimoThree. MIMO TechnologyFour. Engineering Practice802.11a,b,g,n, physical layer baseband MATLAB simulation has been completed, excellent performanceThe DSP engineering PracticeFive. If you need to agree to the corresponding physical layer simulation code, MATLAB simulation link code, and DSP C language Program, please contact qq:1279682290XV of
Catch Bag Preparation
Capture Analysis Toolbar:
Before starting the bag, the user needs to filter the settings, including the following options:
Select Network card
If you have more than one network card, you need to select the network card that catches the desired data.
Protocol filtering
For the Internet Communications Section, the common IP packet types are: tcp/udp/icmp. The vast majority of TCP connections, such as HTTP (s)/smtp/pop3
3.4.1 What is HTTPS
HTTPS (full name: Hypertext Transfer Protocol over secure Socket Layer) is a security-targeted HTTP channel and is simply a secure version of HTTP. That is, the SSL layer is added under HTTP, the security base of HTTPS is SSL, so the details of encryption see SSL.
See figure below:
The port number used for HTTPS is 443. implementation principle of 3.4.2 HTTPS
There are two basic types of encryption and decryption algorithms:
I don't know how long I spent on this Protocol. Someone asked me what happened. This protocol is not long, but it is very hard for me to understand it, I came back today to see how many times I suddenly understood it (80% ).
In fact, these things should have been around for the next month, and they have been around until now. In fact, they can't be understood from time to time.
# Ifndef protocol_base_h # de
A library to useProtobuffer has two C # implementations, of which the Protobuffer-csharp version is more suitable for cross-language development, and this version mimics the Java implementation; On iOS, we want to use the Lite version, and we need to change the code and drop the Pluginregistry function, otherwise it cannot be used on iOS, the iOS platform mono only supports AOT.The Protobuffer-csharp code after castration:To be continued (subsequent provision) Two
Assume that computer A and computer B communicate through RS232 serial port
A and B negotiate to use the software handshake protocol (DCB. foutx = true) and define xonchar/xoffchar, for example, xonchar = 1,
Xoffchar = 2.
Now, a sends 2 characters to B, and B sends a string "helloworld" to A. Can a receive the string "helloworld? No.
After B sends character 1 to A, a will receive the string "helloworld ".
Q: Why does a send xoffchar to B? Or does
Problem description:
1. received a call from O M colleagues, said that the execution of the stored procedure on database a error: ORA-3113 communication channel file end also reported this error, the stored procedure is to access database B through link;
2. There are three tables in the remote database in the stored procedure, one of which is in the SELECT statement and hung. No error is reported;
3. query the table in database B and report the
The development of the alpha version of the locker server is in the final stage. So far, the main network communication work has been completed. Therefore, the communication protocol of the locker server has been determined.
The operations of the locker server include obtaining the lock, releasing the lock, querying the lock status, batch obtaining the lock, batc
It 's written in front .Unofficial translation of cassandra3.x official documents. The level of translation content is entirely dependent on my English proficiency and understanding of Cassandra. Therefore, it is strongly recommended to read the English version of Cassandra 3.x official documents. Half of this document is translation, and half is personal knowledge of Cassandra. Try to annotate my understanding by the way I refer to it as a distinction. In addition, document translation is a lon
According to the TCP protocol three handshake, the server is in the listening state, and so on to receive the client's request connection (connect) signal, accept the connection.server:1 #include This article is from the "Small Town Moss" blog, please make sure to keep this source http://fengbaoli.blog.51cto.com/10538178/1782252Inter-process communication based on TCP p
Zookeeper ORA-03106: fatal two-task communication protocol error
Two-task common errors are generally RDBMS related issues, but cocould be caused by a problem with SQL * Net, or an application (I. e. Pro * C ).Possible causes of ORA-03106:========= Possible reasons for the ORA-03106 errors include:1. Incompatibilities between the client application and the RDBMS server.For example, version incompatibilitie
();//Close output stream5. Close ResourcesBr.close ();Isr.close ();Is.close ();Pw.close ();Os.close ();Socket.close ();Server.close ();Second, the client1. Create a client socket, specify the server address and port number to connect toSocket socket = new Socket ("127.0.0.1", 8888);2, get the output stream, send information to the server sideOutputStream OS = Socket.getoutputstream ();//byte streamPrintWriter pw = new PrintWriter (OS);//Print FlowPw.write ("username: admin; password: 123");Pw.f
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