mbed-os-examples / Mbed OS mbed-os-example-mbed5-sockets

This is a quick example of a simple HTTP client program using the network-socket API that is provided as a part of mbed-os. The program brings up an underlying network interface, and uses it to perform an HTTP transaction over a TCPSocket.

main.cpp@48:f2739ac5cb01, 2018-06-18 (annotated)

Committer:
mbed_official
Date:
Mon Jun 18 09:15:03 2018 +0100
Revision:
48:f2739ac5cb01
Parent:
47:08787ef063cb
Child:
49:1923a727df5b
Merge remote-tracking branch 'origin/mbed-os-5.9.0-oob'



* origin/mbed-os-5.9.0-oob:

  Print Mbed OS version

  Updating mbed-os to mbed-os-5.9.0-rc3

  Updating mbed-os to mbed-os-5.9.0-rc2

  Use Ethernet by default on all platforms.

  Add Jenkinsfile

  Use Ethernet by default on ODIN_W2

  Updating mbed-os to mbed-os-5.9.0-rc1



.

Commit copied from https://github.com/ARMmbed/mbed-os-example-sockets

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 0:17bd84fc5087 1 #include "mbed.h"
mbed_official 5:3e952c60d705 2 #include "EthernetInterface.h"
mbed_official 0:17bd84fc5087 3
mbed_official 5:3e952c60d705 4 // Network interface
mbed_official 5:3e952c60d705 5 EthernetInterface net;
mbed_official 0:17bd84fc5087 6
mbed_official 0:17bd84fc5087 7 // Socket demo
mbed_official 5:3e952c60d705 8 int main() {
mbed_official 47:08787ef063cb 9 int remaining;
mbed_official 47:08787ef063cb 10 int rcount;
mbed_official 47:08787ef063cb 11 char *p;
mbed_official 47:08787ef063cb 12 char *buffer = new char[256];
mbed_official 47:08787ef063cb 13 nsapi_size_or_error_t r;
mbed_official 47:08787ef063cb 14
mbed_official 5:3e952c60d705 15 // Bring up the ethernet interface
mbed_official 5:3e952c60d705 16 printf("Ethernet socket example\n");
mbed_official 48:f2739ac5cb01 17
mbed_official 48:f2739ac5cb01 18 #ifdef MBED_MAJOR_VERSION
mbed_official 48:f2739ac5cb01 19 printf("Mbed OS version %d.%d.%d\n\n", MBED_MAJOR_VERSION, MBED_MINOR_VERSION, MBED_PATCH_VERSION);
mbed_official 48:f2739ac5cb01 20 #endif
mbed_official 48:f2739ac5cb01 21
mbed_official 47:08787ef063cb 22 r = net.connect();
mbed_official 47:08787ef063cb 23 if (r != 0) {
mbed_official 47:08787ef063cb 24 printf("Error! net.connect() returned: %d\n", r);
mbed_official 47:08787ef063cb 25 }
mbed_official 0:17bd84fc5087 26
mbed_official 0:17bd84fc5087 27 // Show the network address
mbed_official 5:3e952c60d705 28 const char *ip = net.get_ip_address();
mbed_official 13:ed9e4aa00044 29 const char *netmask = net.get_netmask();
mbed_official 13:ed9e4aa00044 30 const char *gateway = net.get_gateway();
mbed_official 13:ed9e4aa00044 31 printf("IP address: %s\n", ip ? ip : "None");
mbed_official 13:ed9e4aa00044 32 printf("Netmask: %s\n", netmask ? netmask : "None");
mbed_official 13:ed9e4aa00044 33 printf("Gateway: %s\n", gateway ? gateway : "None");
mbed_official 0:17bd84fc5087 34
mbed_official 0:17bd84fc5087 35 // Open a socket on the network interface, and create a TCP connection to mbed.org
mbed_official 5:3e952c60d705 36 TCPSocket socket;
mbed_official 47:08787ef063cb 37 r = socket.open(&net);
mbed_official 47:08787ef063cb 38 if (r != 0) {
mbed_official 47:08787ef063cb 39 printf("Error! socket.open() returned: %d\n", r);
mbed_official 47:08787ef063cb 40 }
mbed_official 0:17bd84fc5087 41
mbed_official 47:08787ef063cb 42 r = socket.connect("api.ipify.org", 80);
mbed_official 47:08787ef063cb 43 if (r != 0) {
mbed_official 47:08787ef063cb 44 printf("Error! socket.connect() returned: %d\n", r);
mbed_official 47:08787ef063cb 45 }
mbed_official 47:08787ef063cb 46
mbed_official 47:08787ef063cb 47 // Send a simple http request
mbed_official 47:08787ef063cb 48 char sbuffer[] = "GET / HTTP/1.1\r\nHost: api.ipify.org\r\nConnection: close\r\n\r\n";
mbed_official 47:08787ef063cb 49 nsapi_size_t size = strlen(sbuffer);
mbed_official 0:17bd84fc5087 50
mbed_official 47:08787ef063cb 51 // Loop until whole request send
mbed_official 47:08787ef063cb 52 while(size) {
mbed_official 47:08787ef063cb 53 r = socket.send(sbuffer+r, size);
mbed_official 47:08787ef063cb 54 if (r < 0) {
mbed_official 47:08787ef063cb 55 printf("Error! socket.connect() returned: %d\n", r);
mbed_official 47:08787ef063cb 56 goto disconnect;
mbed_official 47:08787ef063cb 57 }
mbed_official 47:08787ef063cb 58 size -= r;
mbed_official 47:08787ef063cb 59 printf("sent %d [%.*s]\n", r, strstr(sbuffer, "\r\n")-sbuffer, sbuffer);
mbed_official 40:afef93b6d854 60 }
mbed_official 47:08787ef063cb 61
mbed_official 47:08787ef063cb 62 // Receieve an HTTP response and print out the response line
mbed_official 47:08787ef063cb 63 remaining = 256;
mbed_official 47:08787ef063cb 64 rcount = 0;
mbed_official 47:08787ef063cb 65 p = buffer;
mbed_official 47:08787ef063cb 66 while (0 < (r = socket.recv(p, remaining))) {
mbed_official 47:08787ef063cb 67 p += r;
mbed_official 47:08787ef063cb 68 rcount += r;
mbed_official 47:08787ef063cb 69 remaining -= r;
mbed_official 47:08787ef063cb 70 }
mbed_official 47:08787ef063cb 71 if (r < 0) {
mbed_official 47:08787ef063cb 72 printf("Error! socket.recv() returned: %d\n", r);
mbed_official 47:08787ef063cb 73 goto disconnect;
mbed_official 47:08787ef063cb 74 }
mbed_official 47:08787ef063cb 75
mbed_official 13:ed9e4aa00044 76 printf("recv %d [%.*s]\n", rcount, strstr(buffer, "\r\n")-buffer, buffer);
mbed_official 13:ed9e4aa00044 77
mbed_official 13:ed9e4aa00044 78 // The api.ipify.org service also gives us the device's external IP address
mbed_official 47:08787ef063cb 79 p = strstr(buffer, "\r\n\r\n")+4;
mbed_official 47:08787ef063cb 80 printf("External IP address: %.*s\n", rcount-(p-buffer), p);
mbed_official 47:08787ef063cb 81 delete[] buffer;
mbed_official 0:17bd84fc5087 82
mbed_official 47:08787ef063cb 83 disconnect:
mbed_official 0:17bd84fc5087 84 // Close the socket to return its memory and bring down the network interface
mbed_official 0:17bd84fc5087 85 socket.close();
mbed_official 0:17bd84fc5087 86
mbed_official 5:3e952c60d705 87 // Bring down the ethernet interface
mbed_official 5:3e952c60d705 88 net.disconnect();
mbed_official 0:17bd84fc5087 89 printf("Done\n");
mbed_official 0:17bd84fc5087 90 }