Example program that uses the mbed UbloxATCellularInterface or OnboardCellularInterface classes to perform simple sockets operations. This program can be used on the C027 and C030 boards, including the C030 N2xx version with a little editing.

Dependencies:   ublox-at-cellular-interface ublox-cellular-base ublox-cellular-base-n2xx ublox-at-cellular-interface-n2xx

main.cpp

Committer:
fahimalavi
Date:
17 months ago
Revision:
42:2962a8eaacb7
Parent:
38:e09e02c31ba1

File content as of revision 42:2962a8eaacb7:

/* mbed Microcontroller Library
 * Copyright (c) 2017 u-blox
 *
 * 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 "UbloxATCellularInterface.h"
#include "UbloxATCellularInterfaceN2xx.h"

// You must select the correct interface library for your board, by
// uncommenting the correct line below. Supported combinations are
// indicated with a "Y" in the table below.
//
//                            C030_U201   C030_N211      C027     C030_R41XM
// UbloxATCellularInterface       Y            -           Y          Y
// UbloxATCellularInterfaceN2xx   -            Y           -          -
// Note: the N211 module supports only UDP, not TCP

// UbloxATCellularInterface and UbloxATCellularInterfaceN2xx
// uses an IP stack on the cellular module and hence uses less RAM (significant on C027).
// This also allows other AT command operations (e.g. sending an SMS) to happen
// during a data transfer (for which you should replace the
// UbloxATCellularInterface library with the UbloxATCellularInterfaceExt
// library).  However, it is slower than using the LWIP/PPP on the mbed
// MCU interface since more string parsing is required.
#define INTERFACE_CLASS  UbloxATCellularInterface
//#define INTERFACE_CLASS  UbloxATCellularInterfaceN2xx

// The credentials of the SIM in the board.  If PIN checking is enabled
// for your SIM card you must set this to the required PIN.
#define PIN "0000"

// Network credentials.  You should set this according to your
// network/SIM card.  For C030 non-N2xx boards, leave the parameters as NULL
// otherwise, if you do not know the APN for your network, you may
// either try the fairly common "internet" for the APN (and leave the
// username and password NULL), or you may leave all three as NULL and then
// a lookup will be attempted for a small number of known networks
// (see APN_db.h in mbed-os/features/netsocket/cellular/utils).
#define APN         NULL
#define USERNAME    NULL
#define PASSWORD    NULL
#define TCP_SERVER "os.mbed.com"

// LEDs
DigitalOut ledRed(LED1, 1);
DigitalOut ledGreen(LED2, 1);
DigitalOut ledBlue(LED3, 1);

// The user button
volatile bool buttonPressed = false;

static void good() {
    ledGreen = 0;
    ledBlue = 1;
    ledRed = 1;
}

static void bad() {
    ledRed = 0;
    ledGreen = 1;
    ledBlue = 1;
}

static void event() {
    ledBlue = 0;
    ledRed = 1;
    ledGreen = 1;
}

static void pulseEvent() {
    event();
    wait_ms(500);
    good();
}

static void ledOff() {
    ledBlue = 1;
    ledRed = 1;
    ledGreen = 1;
}

static void printNtpTime(char * buf, int len)
{
    time_t timestamp = 0;
    struct tm *localTime;
    char timeString[25];
    time_t TIME1970 = 2208988800U;

    if (len >= 43) {
        timestamp |= ((int) *(buf + 40)) << 24;
        timestamp |= ((int) *(buf + 41)) << 16;
        timestamp |= ((int) *(buf + 42)) << 8;
        timestamp |= ((int) *(buf + 43));
        timestamp -= TIME1970;
        localTime = localtime(&timestamp);
        if (localTime) {
            if (strftime(timeString, sizeof(timeString), "%a %b %d %H:%M:%S %Y", localTime) > 0) {
                printf("NTP timestamp is %s.\n", timeString);
            }
        }
    }
}

static void cbButton()
{
    buttonPressed = true;
}

/* This example program for the u-blox C030 and C027 boards instantiates
 * the UbloxATCellularInterface and uses it to make a simple sockets
 * connection to a server, using 2.pool.ntp.org for UDP and developer.mbed.org for TCP.
 * For a more comprehensive example, where higher layer protocols
 * make use of the same sockets interface, see example-ublox-mbed-client.
 * Progress may be monitored with a serial terminal running at 9600 baud.
 * The LED on the C030 board will turn green when this program is
 * operating correctly, pulse blue when a sockets operation is completed
 * and turn red if there is a failure.
 */

int main()
{
    INTERFACE_CLASS *interface = new INTERFACE_CLASS();
    // If you need to debug the cellular interface, comment out the
    // instantiation above and uncomment the one below.
    // For the N2xx interface, change xxx to MBED_CONF_UBLOX_CELL_BAUD_RATE,
    // while for the non-N2xx interface change it to MBED_CONF_UBLOX_CELL_N2XX_BAUD_RATE.
//    INTERFACE_CLASS *interface = new INTERFACE_CLASS(MDMTXD, MDMRXD,
//                                                     xxx,
//                                                     true);
#ifndef TARGET_UBLOX_C030_N211
    TCPSocket sockTcp;
#endif
    UDPSocket sockUdp;
    SocketAddress udpServer;
    SocketAddress udpSenderAddress;
    SocketAddress tcpServer;
    char buf[1024];
    int x;
#ifdef TARGET_UBLOX_C027
    // No user button on C027
    InterruptIn userButton(NC);
#else
    InterruptIn userButton(SW0);
#endif
    
    // Attach a function to the user button
    userButton.rise(&cbButton);
    
    good();
    printf("Starting up, please wait up to 180 seconds for network registration to complete...\n");
    interface->set_credentials(APN, USERNAME, PASSWORD);
    for (x = 0; interface->connect(PIN) != 0; x++) {
        if (x > 0) {
            bad();
            printf("Retrying (have you checked that an antenna is plugged in and your APN is correct?)...\n");
        }
    }
    pulseEvent();
    
    printf("Getting the IP address of \"developer.mbed.org\" and \"2.pool.ntp.org\"...\n");
    if ((interface->gethostbyname("2.pool.ntp.org", &udpServer) == 0) &&
        (interface->gethostbyname(TCP_SERVER, &tcpServer) == 0)) {
        pulseEvent();

        udpServer.set_port(123);
        tcpServer.set_port(80);
        printf("\"2.pool.ntp.org\" address: %s on port %d.\n", udpServer.get_ip_address(), udpServer.get_port());
        printf("\"os.mbed.com\" address: %s on port %d.\n", tcpServer.get_ip_address(), tcpServer.get_port());

        printf("Performing socket operations in a loop (until the user button is pressed on C030 or forever on C027)...\n");
        while (!buttonPressed) {
            // UDP Sockets
            printf("=== UDP ===\n");
            printf("Opening a UDP socket...\n");
            if (sockUdp.open(interface) == 0) {
                pulseEvent();
                printf("UDP socket open.\n");
                sockUdp.set_timeout(10000);
                printf("Sending time request to \"2.pool.ntp.org\" over UDP socket...\n");
                memset (buf, 0, sizeof(buf));
                *buf = '\x1b';
                if (sockUdp.sendto(udpServer, (void *) buf, 48) == 48) {
                    pulseEvent();
                    printf("Socket send completed, waiting for UDP response...\n");
                    x = sockUdp.recvfrom(&udpSenderAddress, buf, sizeof (buf));
                    if (x > 0) {
                        pulseEvent();
                        printf("Received %d byte response from server %s on UDP socket:\n"
                               "-------------------------------------------------------\n",
                               x, udpSenderAddress.get_ip_address());
                        printNtpTime(buf, x);
                        printf("-------------------------------------------------------\n");
                    }
                }                
                printf("Closing socket...\n");
                sockUdp.close();
                pulseEvent();
                printf("Socket closed.\n");
            }
            
#ifndef TARGET_UBLOX_C030_N211
            // TCP Sockets
            printf("=== TCP ===\n");
            printf("Opening a TCP socket...\n");
            if (sockTcp.open(interface) == 0) {
                pulseEvent();
                printf("TCP socket open.\n");
                sockTcp.set_timeout(10000);
                printf("Connecting socket to %s on port %d...\n", tcpServer.get_ip_address(), tcpServer.get_port());
                if (sockTcp.connect(tcpServer) == 0) {
                    pulseEvent();
                    printf("Connected, sending HTTP GET request to %s over socket...\n", TCP_SERVER);
                    strcpy (buf, "GET /media/uploads/mbed_official/hello.txt HTTP/1.0\r\n\r\n");
                    // Note: since this is a short string we can send it in one go as it will
                    // fit within the default buffer sizes.  Normally you should call sock.send()
                    // in a loop until your entire buffer has been sent.
                    if (sockTcp.send((void *) buf, strlen(buf)) == (int) strlen(buf)) {
                        pulseEvent();
                        printf("Socket send completed, waiting for response...\n");
                        x = sockTcp.recv(buf, sizeof (buf));
                        if (x > 0) {
                            pulseEvent();
                            printf("Received %d byte response from server on TCP socket:\n"
                                   "----------------------------------------------------\n%.*s"
                                   "----------------------------------------------------\n",
                                    x, x, buf);
                        }
                    }
                }
                printf("Closing socket...\n");
                sockTcp.close();
                pulseEvent();
                printf("Socket closed.\n");
            }
#endif
            wait_ms(5000);
#ifndef TARGET_UBLOX_C027
            printf("[Checking if user button has been pressed]\n");
#endif
        }
        
        pulseEvent();
        printf("User button was pressed, stopping...\n");
        interface->disconnect();
        ledOff();
        printf("Stopped.\n");
    } else {
        bad();
        printf("Unable to get IP address of \"developer.mbed.org\" or \"2.pool.ntp.org\".\n");
    }
}
// End Of File