The IBCmodule interface defines how packetsĪnd messages are constructed to be interpreted by the sending and the receiving ThisĮnd-to-end, connection-oriented, stateful protocol provides reliable, ordered,Īnd authenticated communication between heterogeneous blockchains. IBC handles transport across different sovereign blockchains. The Inter-Blockchain Communication protocol (IBC) allows blockchains to talk toĮach other. Create a basic blog post and save the post on another blockchain.Navigate between blockchains using the Cosmos SDK and the Ignite CLI Relayer.Use IBC to create and send packets between blockchains.This foundational knowledge helps you navigate
#Packet sender tutorial how to
This tutorial builds an understanding of how to create and The Hello World tutorial is a time-honored tradition inĬomputer programming. N WSUDPSND.The Inter-Blockchain Communication protocol (IBC) is an important part of theĬosmos SDK ecosystem.
Packet is sent, an error check is made, the socket is closed and WSACleanup is called. Printf("\"%s\" sent to %s\n", szMessage, szAddress) (SOCKADDR_IN *) &addr, sizeof(addr)) failed with:\n%d\n", Printf("Error\nCall to sendto(s, szMessage, iMessageLen, 0,
Ret = sendto(s, szMessage, iMessageLen, 0, (struct sockaddr *) The receiver and the address structure length. You use this function, you use the first four arguments as you would using send, the fifth and sixth arguments however are set to the address of It to 0), the fifth is a pointer to a sockaddr structure representing theĪddress of the receiver and finally, the last argument is the length of the sockaddr structure. Packet, the third is the length of the data, the fourth is some flags (just set Second is a pointer to a buffer holding the data you want to send in the With the sendto function, which is declared as:Ĭhar FAR * buf, int len, int flags, const struct sockaddr FAR * to, int tolen) įirst argument to sendto is the UDP socket you’re sending on, the Have to tell Winsock the address of the receiver in another way, this is done UDP socket is never connected to the receiver (you can Resolves it using the resolving techniques learned in Lesson 2. Resolving is done the same way as in the TCP client, you assume that theĪddress is in numeric form () and if it doesn’t work, it The differentįamily/type/protocol combinations can be found in Lesson 2,īecause it’s the only protocol you can use with AF_INET and SOCK_DGRAM.
#Packet sender tutorial code
The code creates a socket of the AF_INET family (for the TCP/IP protocol), the SOCK_DGRAM type (for a datagram-based socket) and IPPROTO_UDP protocol (tells Winsock to use the UDP protocol). Memcpy(&addr.sin_addr, host->h_addr_list, Printf("Error\nUnknown host: %s\n", szAddress) If(addr.sin_addr.s_addr = INADDR_NONE) // Printf("Error\nCall to socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP) Īddr.sin_addr.s_addr = inet_addr(szAddress) S = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP) Printf("Invalid port number! (%s)\n", argv) Īrguments, checks if the port number is valid and initializes Winsock, if youĪren’t familiar with these concepts, see Lesson 2.Ĭomes the first major difference between the TCP client and the UDP sender, the Printf(" port: the port on the remote server\n") description: A UDP packet sender that sends a Probably know this part of the code by now, but I’ll show it anyway, for Obtaining command-line arguments and initialization TCP howeverĬan be compared with a phone call, you exchange information simultaneously and you are guaranteed that the information is delivered. That the mail will reach its destination (although it often does). You can compare UDP with the postal service, you aren’t guaranteed Unlike TCP, UDP doesn’t guarantee that your information reaches itsĭestination. “connections” to the receiver, you only send messages. Protocol is somewhat different from the TCP protocol, the most importantĭifference is that it’s message-based, that is you don’t establish any
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