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
- Committer:
- mbed_official
- Date:
- 2018-05-02
- Revision:
- 43:9f41b37edee9
- Parent:
- 40:afef93b6d854
- Child:
- 47:08787ef063cb
File content as of revision 43:9f41b37edee9:
#include "mbed.h" #include "EthernetInterface.h" // Network interface EthernetInterface net; // Socket demo int main() { // Bring up the ethernet interface printf("Ethernet socket example\n"); net.connect(); // Show the network address const char *ip = net.get_ip_address(); const char *netmask = net.get_netmask(); const char *gateway = net.get_gateway(); printf("IP address: %s\n", ip ? ip : "None"); printf("Netmask: %s\n", netmask ? netmask : "None"); printf("Gateway: %s\n", gateway ? gateway : "None"); // Open a socket on the network interface, and create a TCP connection to mbed.org TCPSocket socket; socket.open(&net); socket.connect("api.ipify.org", 80); char *buffer = new char[256]; // Send an HTTP request strcpy(buffer, "GET / HTTP/1.1\r\nHost: api.ipify.org\r\nConnection: close\r\n\r\n"); int scount = socket.send(buffer, strlen(buffer)); printf("sent %d [%.*s]\n", scount, strstr(buffer, "\r\n")-buffer, buffer); // Recieve an HTTP response and print out the response line int received = 0; int remaining = 256; int rcount = 0; char *p = buffer; while (0 != (received = socket.recv(p, remaining))) { p += received; rcount += received; remaining -= received; } printf("recv %d [%.*s]\n", rcount, strstr(buffer, "\r\n")-buffer, buffer); // The api.ipify.org service also gives us the device's external IP address const char *payload = strstr(buffer, "\r\n\r\n")+4; printf("External IP address: %.*s\n", rcount-(payload-buffer), payload); // Close the socket to return its memory and bring down the network interface socket.close(); delete[] buffer; // Bring down the ethernet interface net.disconnect(); printf("Done\n"); }