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TCP/UDP 통신연습

TCP/UDP is used to setup connections between clients and servers, which are used for TCP/UDP clients communicating with servers.

 

Example TCP Echo Server:

TCP Echo server Description IP Port
echo.mbedcloudtesting.com   52.215.34.155 7

tcpbin.com

(“https://tcpbin.com/” to get certificate)

  45.79.112.203 4242
Echo with TLS encryption 45.79.112.203 4243
Echo with mutual authentication 45.79.112.203 4244

 

 

 

1. TCP/UPD 통신 설정과정

 

 

 

 

 

2. TCP/UPD 통신 명령시퀀스

 

NO Command Response 설명
1 PDP Context 설정    
2 AT+CIPMODE?

+CIPMODE: 0

OK

TCP/UDP Data Mode 확인

(Non-Transparent Data Mode로 설정됨)

  AT+CIPMODE=<mode>

+CIPMODE: 0

OK

Data Mode 설정
3 AT+NETOPEN

OK

+NETOPEN: 0

(1) PDP Context 활성화

(2) TCP/UDP 서비스 시작

  AT+NETOPEN?

OK

+NETOPEN: 1

TCP/UDP 서비스상태 확인
  AT+IPADDR

+IPADDR: 10.17.88.228

OK

Networks에서 할당된 IP 확인
4 AT+CIPRXGET?

+CIPRXGET: 0

OK

Data RX Mode 확인
  AT+CIPRXGET=0 OK Data RX Mode 설정
5 AT+CIPOPEN=0,”TCP”,”yahoo.com”,80 +CIPOPEN: 0,0  TCP/UDP Socket 연결 설정
AT+CIPOPEN?

+CIPOPEN: 0,”TCP”,”74.6.231.21″,80,-1

+CIPOPEN: 1

+CIPOPEN: 2

+CIPOPEN: 3

+CIPOPEN: 4

+CIPOPEN: 5

+CIPOPEN: 6

+CIPOPEN: 7

+CIPOPEN: 8

+CIPOPEN: 9

OK

 
6.1 AT+CIPSEND=0,34 > TCP/UDP 데이터 송신 설정
6.2 >\r\n GET https://yahoo.com/ip HTTP/1.0\r\n   송신 데이터 입력(HTTP Get 메소드)
  AT+CIPSEND=0, >  
  >123456789\x03\r\n\x1A\r\n  

<ETX> = \x03\r\n

<CTRL+Z> = \x1A\r\n

  +++   Transparent Mode 인 경우, 탈출
7 AT+CIPCLOSE=0

+CSQ: 28,99

OK

소켓  종료
8 AT+NETCLOSE

OK

+NETCLOSE: 0

TCP/UDP 서비스 종료

 

 

 

 

 

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