lora protocol

Note: This is my translation, may not be accurate, may have errors, but basically understandable, hope to be helpful to everyone. (reproduced please specify the source: This article from Learnhard Blog: http://www.codelast.com/ http://blog.csdn.net/learnhard/) This tutorial provides a basic C + + Programmer ' s introduction to working with protocol buffers. By walking through creating a simple example application, it shows · Define message formats in

Mobile device management (MDM) and OMA (OTA) DM protocol wizard (II) -- WAP protocol (1) Connect to "mobile device management (MDM) and OMA (OTA) DM protocol wizard (I )" 16. Can I directly access the WiMAX device through a web server?For more information, see "WAP protocol (1) -- Chapter 1 WAP network deployment"17. C

The linux OSI Layer-7 model, TCP/IP protocol stack, and the structure of each layer reveal big secrets. The osi protocol stack When I learn Linux, I know the OSI model even if I am a little cute. What ?! You don't know !!! Okay, this secret is taken away. Thank you ~~~ I,Two protocols (1OSI protocol model (layer-7) International ProtocolPDU: The data unit transm

Linux2.6 kernel protocol stack series-TCP protocol 1. Send, linux2.6 -- tcp Before introducing the tcp sending function, we must first introduce a key structure sk_buff. in linux, The sk_buff structure represents a packet: See the sending function source code. Here we do not focus on the scattered hardware-aggregation: /* Sendmsg System Call implementation at the TCP layer */int tcp_sendmsg (struct kiocb *

UITableView proxy Protocol Summary, uitableview proxy ProtocolUITableView proxy Protocol Summary1./** total number of groups */-(NSInteger) numberOfSectionsInTableView :( UITableView *) tableView{Return self. personGroups. count;}2./** how many rows each group has */-(NSInteger) tableView :( UITableView *) tableView numberOfRowsInSection :( NSInteger) section{SUNPersonGroupInfo * personGroupInfo = self. per

implementation is that RARP requests are broadcast on the hardware layer, which means that they are not forwarded by the router. In order for the diskless system to boot in the state of the RARP server shutdown, it is usually possible to provide multiple RARP servers on a single network (such as a cable).As the number of servers increases (to provide redundant backups), network traffic increases as each server sends a RARP response to each RARP request. Diskless systems that send RARP requests

1. Datagram (Datagram) format:2. Length Field(1) Header Length field,Hlen,4 bits In 4-byte (or 32bits) units Value: 5~15 (that is, the first length is bytes) (2) Total Length field, sumlength, bits In byte units Header length (i.e. 4 * hlen) + data length Note: What is the maximum length of IP grouping?Answer:655353. Service type field(1) Type of Service (TOS), 8 bits The quality of service that the group expects 4. Shard Control Fields(1) Ident

soon as possibleRST: Re-establish the connectionSYN: The synchronous sequence number is used to initiate a connectionFIN: The originator completes the task6.16bit window Size: TCP Traffic control is the use of this window size. The window size is the number of bytes.7.16bit inspection and: first and data inspection and. Similar to the UPD, a pseudo-header support calculation is required.8.16bit Emergency pointer: The emergency hand is only valid if the Urg is 1.9. Options: The most common is th

OAuth focuses on authorization, while OpenID focuses on authentication. On the face of it, these two English words are easy to confuse, but in fact, their meanings are fundamentally different: Authorization:n. Authorization, recognition, approval, appointment Authentication:n. To prove or identify; confirm. OAuth is concerned with authorization, that is, "what the user can do", and OpenID is concerned with the proof that: "Who the user is".If the meaning of OAuth and OpenID is confuse

in order to provide services to the client, get the contents of the client, you can get the client object connected through the Accept method.3, you can communicate by getting the socket stream in the socket object and the specific client.4, if the communication is over, close the resource. Note: To close the client first, then close the server.Class tcpserver{public static void Main (string[] args) throws exception{ServerSocket ss = new ServerSocket (10002);//Socket Service set up for serverSo

[Mobile Security] mobile application encryption protocol reverse analysis is successful, and mobile application encryption protocol 1. Related tools:Apktoolkitv2.1, Jeb cracked version Apk.2. analysis process:Confirm the data transmission process: decompile the apk file using the tool, and then use the jeb software to find the suspected algorithm location. Use the log printing method to check whether the pr

cached locally, saving the time it takes for the picture to be transferred over the network. If the site is large and there are n cache servers, how long will this n cache server cache the file cache on the primary server? 1. Do not cache. 2. How long is the cache? Thinking------This shows that there should be some protocol between the cache server and the primary server to illustrate these issues Ask------What agreement to use to explain these 2

1. TCP connectionTCP (transmission Control Protocol) transmission protocol. TCP is the host-to-host layer of the Transmission Control Protocol, providing a reliable connection service, using three-time handshake confirmation to establish a connection. The bit code is the TCP flag bit, there are 6 kinds of marking: SYN (synchronous set up) ACK (acknowledgement ack

TCP the difference between protocol and UDP protocolfirst, let's get this straight.TCPagreements andUCPAgreement andTCP/IPagreement, a lot of people are confused, has always been saidTCP/IPAgreement andUDPthe difference between the protocols, I think it is not clear from the nature of network communication! TCP/IPthe protocol is a protocol cluster. It includes a

IP datagram Header highest bit on the left, recorded as 0 bit, the lowest bit on the right, recorded as a bitVersion:4 bits, refers to the IP protocol version of the current IP protocol version number is 4 (that is, IPV4)Header Length:4 bits, the maximum value that can be represented is 15 units (4 bytes in one unit) so the maximum of the first ministerial degree of the IP is 60 bytesDifferentiated Services

Tutorial on http protocol and http protocolSummary Hyper Text documents contain hyperlinks that point to other resources. Hypertext document is the foundation of World Wide Web (www. The HTTP protocol solves the problem of file transmission. HTTP is an application layer protocol, mainly based on TCP protocol (occasion

The routing information protocol (RIP) is one of the earliest and most basic protocols in the routing protocol. Although its current use is gradually unable to meet our network construction needs, we still need to fully master this protocol as a learning basis. Like all protocols, the RIP Protocol is used to distribute