USR IOT USR-TCP232-302 - Upper computer Socket programming example

USR-TCP232-302 User Manual h.usriot.com
Jinan USR IOT Technology Limited www.usriot.com
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AppendixⅡ:ID type of Independent ID
This byte is the last byte of 3 bytes, additional meaning is as follows:
bit0(1) send ID when connecting;
bit1(2)send ID when send data;
bit2(4) RS485;
bit3(8) NC;
bit4(16) Reset;
bit5(32) Link-state;
bit6(64) tcp server index;
bit7(128) baud rate synchronization, similar RFC2217.
When each bit is 1, it means related function is invalid. Otherwise, it is valid, default is
RS485 and similar RFC2217 set 1 .(turn on function, value is 0x84 )
Appendix Ⅲ:Upper computer Socket programming example
Server Socket code:
1. #include <stdio.h>
2. #include <string.h>
3. #include <sys/socket.h>
4. #include <netinet/in.h>
5. #include <stdlib.h>
6. #include <syslog.h>
7. #include <errno.h>
8. #define MAX_LISTEN_NUM 5
9. #define SEND_BUF_SIZE 100
10. #define RECV_BUF_SIZE 100
11. #define LISTEN_PORT 1010
12. int main()
13. {
14. int listen_sock = 0;
15. int app_sock = 0;
16. struct sockaddr_in hostaddr;
17. struct sockaddr_in clientaddr;
18. int socklen = sizeof(clientaddr);
19. char sendbuf[SEND_BUF_SIZE] = {0};
20. char recvbuf[RECV_BUF_SIZE] = {0};
21. int sendlen = 0;
22. int recvlen = 0;
23. int retlen = 0;
24. int leftlen = 0;
25. char *ptr = NULL;
26. memset((void *)&hostaddr, 0, sizeof(hostaddr));