Mbed OS 5.15.8: Disable power save mode.

UBLOX_AT.cpp

nsapi_error_t UBLOX_AT::init()
{
    setup_at_handler();

    _at->lock();
    _at->flush();
    _at->at_cmd_discard("", "");

    nsapi_error_t err = NSAPI_ERROR_OK;

#ifdef UBX_MDM_SARA_G3XX
    err = _at->at_cmd_discard("+CFUN", "=0");

    if (err == NSAPI_ERROR_OK) {
        _at->at_cmd_discard("E0", ""); // echo off
        _at->at_cmd_discard("+CMEE", "=1"); // verbose responses
        config_authentication_parameters();
        err = _at->at_cmd_discard("+CFUN", "=1"); // set full functionality
    }
#elif defined(UBX_MDM_SARA_U2XX) || defined(UBX_MDM_SARA_R41XM)
    err = _at->at_cmd_discard("+CFUN", "=4");
    if (err == NSAPI_ERROR_OK) {
        _at->at_cmd_discard("E0", ""); // echo off
        _at->at_cmd_discard("+CMEE", "=1"); // verbose responses
        /* Taken from Mbed OS Ublox cellular base library. */
        _at->at_cmd_discard("&K3", ""); /* Turn off RTC/CTS handshaking. K3: Ublox default, K0: Ublox Mbed lib (dont work). */
        _at->at_cmd_discard("&C1", ""); /* Set DCD circuit(109), changes in accordance with the carrier detect status. C1: Ublox default, C1: Ublox Mbed lib. */
        _at->at_cmd_discard("&D1", ""); /* Set DTR circuit, we ignore the state change of DTR. D1: Ublox default, D0: Ublox Mbed lib. */
        /* Disable power saving modes with AT commands: */
        _at->at_cmd_discard("+CEDRXS", "=0,2");
        _at->at_cmd_discard("+CPSMS", "=0");
        _at->at_cmd_discard("+UPSMR", "=0");
        _at->at_cmd_discard("+UPSV", "=0");
        /* Or with Mbed function:
         * set_power_save_mode(0, 0);
         */
        config_authentication_parameters();
        err = _at->at_cmd_discard("+CFUN", "=1"); // set full functionality
    }
#else
    _at->unlock();
    return NSAPI_ERROR_UNSUPPORTED;
#endif

    return _at->unlock_return_error();
}