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main.cpp
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main.cpp
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/*
* Copyright (c) 2017 ARM Limited. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
* 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 "common_functions.h"
#include "UDPSocket.h"
#include "OnboardCellularInterface.h"
#define UDP 0
#define TCP 1
// SIM pin code goes here
#ifndef MBED_CONF_APP_SIM_PIN_CODE
# define MBED_CONF_APP_SIM_PIN_CODE "1234"
#endif
#ifndef MBED_CONF_APP_APN
# define MBED_CONF_APP_APN "internet"
#endif
#ifndef MBED_CONF_APP_USERNAME
# define MBED_CONF_APP_USERNAME NULL
#endif
#ifndef MBED_CONF_APP_PASSWORD
# define MBED_CONF_APP_PASSWORD NULL
#endif
// Number of retries /
#define RETRY_COUNT 3
// CellularInterface object
OnboardCellularInterface iface;
// Echo server hostname
const char *host_name = "echo.u-blox.com";
// Echo server port (same for TCP and UDP)
const int port = 7;
/**
* Connects to the Cellular Network
*/
nsapi_error_t do_connect()
{
nsapi_error_t retcode;
uint8_t retry_counter = 0;
while (!iface.is_connected()) {
retcode = iface.connect();
if (retcode == NSAPI_ERROR_AUTH_FAILURE) {
printf("\n\nAuthentication Failure. Exiting application\n");
return retcode;
} else if (retcode != NSAPI_ERROR_OK) {
printf("\n\nCouldn't connect: %d, will retry\n", retcode);
retry_counter++;
continue;
} else if (retcode != NSAPI_ERROR_OK && retry_counter > RETRY_COUNT) {
printf("\n\nFatal connection failure: %d\n", retcode);
return retcode;
}
break;
}
printf("\n\nConnection Established.\n");
return NSAPI_ERROR_OK;
}
/**
* Opens a UDP or a TCP socket with the given echo server and performs an echo
* transaction retrieving current.
*/
nsapi_error_t test_send_recv()
{
nsapi_size_or_error_t retcode;
#if MBED_CONF_APP_SOCK_TYPE == TCP
TCPSocket sock;
#else
UDPSocket sock;
#endif
retcode = sock.open(&iface);
if (retcode != NSAPI_ERROR_OK) {
printf("UDPSocket.open() fails, code: %d\n", retcode);
return -1;
}
SocketAddress sock_addr;
retcode = iface.gethostbyname(host_name, &sock_addr);
if (retcode != NSAPI_ERROR_OK) {
printf("Couldn't resolve remote host: %s, code: %d\n", host_name,
retcode);
return -1;
}
sock_addr.set_port(port);
sock.set_timeout(15000);
int n = 0;
char *echo_string = "TEST";
char recv_buf[4];
#if MBED_CONF_APP_SOCK_TYPE == TCP
retcode = sock.connect(sock_addr);
if (retcode < 0) {
printf("TCPSocket.connect() fails, code: %d\n", retcode);
return -1;
} else {
printf("TCP: connected with %s server\n", host_name);
}
retcode = sock.send((void*) echo_string, sizeof(echo_string));
if (retcode < 0) {
printf("TCPSocket.send() fails, code: %d\n", retcode);
return -1;
} else {
printf("TCP: Sent %d Bytes to %s\n", retcode, host_name);
}
n = sock.recv((void*) recv_buf, sizeof(recv_buf));
#else
retcode = sock.sendto(sock_addr, (void*) echo_string, sizeof(echo_string));
if (retcode < 0) {
printf("UDPSocket.sendto() fails, code: %d\n", retcode);
return -1;
} else {
printf("UDP: Sent %d Bytes to %s\n", retcode, host_name);
}
n = sock.recvfrom(&sock_addr, (void*) recv_buf, sizeof(recv_buf));
#endif
sock.close();
if (n > 0) {
printf("Received from echo server %d Bytes\n", n);
return 0;
}
return -1;
return retcode;
}
int main()
{
iface.modem_debug_on(MBED_CONF_APP_MODEM_TRACE);
/* Set Pin code for SIM card */
iface.set_sim_pin(MBED_CONF_APP_SIM_PIN_CODE);
/* Set network credentials here, e.g., APN*/
iface.set_credentials(MBED_CONF_APP_APN, MBED_CONF_APP_USERNAME, MBED_CONF_APP_PASSWORD);
printf("\n\nmbed-os-example-cellular, Connecting...\n");
/* Attempt to connect to a cellular network */
if (do_connect() == NSAPI_ERROR_OK) {
nsapi_error_t retcode = test_send_recv();
if (retcode == NSAPI_ERROR_OK) {
printf("\n\nSuccess. Exiting \n\n");
return 0;
}
}
printf("\n\nFailure. Exiting \n\n");
return -1;
}
// EOF