jim hamblen / Mbed OS 4180TCPSocket_Example

Alternative TCPSocket example using an HTTP GET to read a short "helloworld" text web page using a different server

Fork of ARMs demo HTTP socket demo. ARM's server was redirected and the demo was no longer working. An alternative server was setup and the code was modified to display the web page text in addition to just "200 OK". Only works for a very short web page - buffer only 500 characters but RAM is running out on the LPC1768 in the demo!

main.cpp

Committer:
4180_1
Date:
2021-02-04
Revision:
3:576f312d2601
Parent:
1:965d7fb768b6

File content as of revision 3:576f312d2601:

#include "mbed.h"
#include "EthernetInterface.h"

// Network interface
EthernetInterface net;

// Socket demo
int main() {
    // Bring up the ethernet interface
    printf("\n\rEthernet socket example\n\r");
    net.connect();

    // Show the network address
    const char *ip = net.get_ip_address();
    printf("IP address is: %s\n\r", ip ? ip : "No IP");

    // Open a socket on the network interface, and create a TCP connection to mbed.org
    TCPSocket socket;
    socket.open(&net);
    socket.connect("hamblen.ece.gatech.edu", 80);

    // Send a simple http request
    char sbuffer[] = "GET /hello.txt HTTP/1.1\r\nHost: hamblen.ece.gatech.edu\r\n\r\n";
    int scount = socket.send(sbuffer, sizeof sbuffer);
    //print out packet
    printf("sent %d [%.*s]\n", scount, strstr(sbuffer, "\r\n")-sbuffer, sbuffer);

    // Recieve a simple http response and print out the response line and text
    char rbuffer[400]; //enough for a very short text page - almost out of RAM!
    int rcount = socket.recv(rbuffer, sizeof rbuffer);
    printf("recv %d [%.*s]\n\r", rcount, strstr(rbuffer, "\r\n"), rbuffer);

    // Close the socket to return its memory and bring down the network interface
    socket.close();

    // Bring down the ethernet interface
    net.disconnect();
    printf("Done\n");
}