switch between cellular modem and ethernet on u-blox C027

C027_mdm_or_eth.cpp

// Include in your project:
// https://developer.mbed.org/teams/ublox/code/C027_Support/
// plus, ONLY when compiling without CELLULAR_NETWORK:
// https://developer.mbed.org/users/mbed_official/code/EthernetInterface/
// https://developer.mbed.org/users/mbed_official/code/mbed-rtos/
#include "mbed.h"

// ...

#define CELLULAR_NETWORK 1

#ifdef CELLULAR_NETWORK
#include "MDM.h"
#define SIMPIN      NULL
#define APN         "Broadband"
#define USERNAME    NULL
#define PASSWORD    NULL 
#else
#include "EthernetInterface.h"
#endif

int main() 
{   
#ifdef CELLULAR_NETWORK
    MDMSerial mdm;
    //mdm.setDebug(4);
    if (!mdm.connect(SIMPIN, APN,USERNAME,PASSWORD))
        return -1;
#else
    EthernetInterface ethernet;
    ethernet.init(); // DHCP
    if (ethernet.connect() != 0)
        return -1;
#endif
    // ...
}