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main.cpp
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main.cpp
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/* Sockets Example
* Copyright (c) 2016-2020 ARM Limited
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mbed.h"
#include "wifi_helper.h"
#include "mbed-trace/mbed_trace.h"
#if MBED_CONF_APP_USE_TLS_SOCKET
#include "root_ca_cert.h"
#ifndef DEVICE_TRNG
#error "mbed-os-example-tls-socket requires a device which supports TRNG"
#endif
#endif // MBED_CONF_APP_USE_TLS_SOCKET
class SocketDemo {
static constexpr size_t MAX_NUMBER_OF_ACCESS_POINTS = 10;
static constexpr size_t MAX_MESSAGE_RECEIVED_LENGTH = 100;
#if MBED_CONF_APP_USE_TLS_SOCKET
static constexpr size_t REMOTE_PORT = 443; // tls port
#else
static constexpr size_t REMOTE_PORT = 80; // standard HTTP port
#endif // MBED_CONF_APP_USE_TLS_SOCKET
public:
SocketDemo() : _net(NetworkInterface::get_default_instance())
{
}
~SocketDemo()
{
if (_net) {
_net->disconnect();
}
}
void run()
{
if (!_net) {
printf("Error! No network interface found.\r\n");
return;
}
/* if we're using a wifi interface run a quick scan */
if (_net->wifiInterface()) {
/* the scan is not required to connect and only serves to show visible access points */
wifi_scan();
/* in this example we use credentials configured at compile time which are used by
* NetworkInterface::connect() but it's possible to do this at runtime by using the
* WiFiInterface::connect() which takes these parameters as arguments */
}
/* connect will perform the action appropriate to the interface type to connect to the network */
printf("Connecting to the network...\r\n");
nsapi_size_or_error_t result = _net->connect();
if (result != 0) {
printf("Error! _net->connect() returned: %d\r\n", result);
return;
}
print_network_info();
/* opening the socket only allocates resources */
result = _socket.open(_net);
if (result != 0) {
printf("Error! _socket.open() returned: %d\r\n", result);
return;
}
#if MBED_CONF_APP_USE_TLS_SOCKET
result = _socket.set_root_ca_cert(root_ca_cert);
if (result != NSAPI_ERROR_OK) {
printf("Error: _socket.set_root_ca_cert() returned %d\n", result);
return;
}
_socket.set_hostname(MBED_CONF_APP_HOSTNAME);
#endif // MBED_CONF_APP_USE_TLS_SOCKET
/* now we have to find where to connect */
SocketAddress address;
if (!resolve_hostname(address)) {
return;
}
address.set_port(REMOTE_PORT);
/* we are connected to the network but since we're using a connection oriented
* protocol we still need to open a connection on the socket */
printf("Opening connection to remote port %d\r\n", REMOTE_PORT);
result = _socket.connect(address);
if (result != 0) {
printf("Error! _socket.connect() returned: %d\r\n", result);
return;
}
/* exchange an HTTP request and response */
if (!send_http_request()) {
return;
}
if (!receive_http_response()) {
return;
}
printf("Demo concluded successfully \r\n");
}
private:
bool resolve_hostname(SocketAddress &address)
{
const char hostname[] = MBED_CONF_APP_HOSTNAME;
/* get the host address */
printf("\nResolve hostname %s\r\n", hostname);
nsapi_size_or_error_t result = _net->gethostbyname(hostname, &address);
if (result != 0) {
printf("Error! gethostbyname(%s) returned: %d\r\n", hostname, result);
return false;
}
printf("%s address is %s\r\n", hostname, (address.get_ip_address() ? address.get_ip_address() : "None") );
return true;
}
bool send_http_request()
{
/* loop until whole request sent */
const char buffer[] = "GET / HTTP/1.1\r\n"
"Host: ifconfig.io\r\n"
"Connection: close\r\n"
"\r\n";
nsapi_size_t bytes_to_send = strlen(buffer);
nsapi_size_or_error_t bytes_sent = 0;
printf("\r\nSending message: \r\n%s", buffer);
while (bytes_to_send) {
bytes_sent = _socket.send(buffer + bytes_sent, bytes_to_send);
if (bytes_sent < 0) {
printf("Error! _socket.send() returned: %d\r\n", bytes_sent);
return false;
} else {
printf("sent %d bytes\r\n", bytes_sent);
}
bytes_to_send -= bytes_sent;
}
printf("Complete message sent\r\n");
return true;
}
bool receive_http_response()
{
char buffer[MAX_MESSAGE_RECEIVED_LENGTH];
int remaining_bytes = MAX_MESSAGE_RECEIVED_LENGTH;
int received_bytes = 0;
/* loop until there is nothing received or we've ran out of buffer space */
nsapi_size_or_error_t result = remaining_bytes;
while (result > 0 && remaining_bytes > 0) {
nsapi_size_or_error_t result = _socket.recv(buffer + received_bytes, remaining_bytes);
if (result < 0) {
printf("Error! _socket.recv() returned: %d\r\n", result);
return false;
}
received_bytes += result;
remaining_bytes -= result;
}
/* the message is likely larger but we only want the HTTP response code */
printf("received %d bytes:\r\n%.*s\r\n\r\n", received_bytes, strstr(buffer, "\n") - buffer, buffer);
return true;
}
void wifi_scan()
{
WiFiInterface *wifi = _net->wifiInterface();
WiFiAccessPoint ap[MAX_NUMBER_OF_ACCESS_POINTS];
/* scan call returns number of access points found */
int result = wifi->scan(ap, MAX_NUMBER_OF_ACCESS_POINTS);
if (result <= 0) {
printf("WiFiInterface::scan() failed with return value: %d\r\n", result);
return;
}
printf("%d networks available:\r\n", result);
for (int i = 0; i < result; i++) {
printf("Network: %s secured: %s BSSID: %hhX:%hhX:%hhX:%hhx:%hhx:%hhx RSSI: %hhd Ch: %hhd\r\n",
ap[i].get_ssid(), get_security_string(ap[i].get_security()),
ap[i].get_bssid()[0], ap[i].get_bssid()[1], ap[i].get_bssid()[2],
ap[i].get_bssid()[3], ap[i].get_bssid()[4], ap[i].get_bssid()[5],
ap[i].get_rssi(), ap[i].get_channel());
}
printf("\r\n");
}
void print_network_info()
{
/* print the network info */
SocketAddress a;
_net->get_ip_address(&a);
printf("IP address: %s\r\n", a.get_ip_address() ? a.get_ip_address() : "None");
_net->get_netmask(&a);
printf("Netmask: %s\r\n", a.get_ip_address() ? a.get_ip_address() : "None");
_net->get_gateway(&a);
printf("Gateway: %s\r\n", a.get_ip_address() ? a.get_ip_address() : "None");
}
private:
NetworkInterface *_net;
#if MBED_CONF_APP_USE_TLS_SOCKET
TLSSocket _socket;
#else
TCPSocket _socket;
#endif // MBED_CONF_APP_USE_TLS_SOCKET
};
int main() {
printf("\r\nStarting socket demo\r\n\r\n");
#ifdef MBED_CONF_MBED_TRACE_ENABLE
mbed_trace_init();
#endif
SocketDemo *example = new SocketDemo();
MBED_ASSERT(example);
example->run();
return 0;
}