Function nrf_modem_at_printf 

pub unsafe extern "C" fn nrf_modem_at_printf(
    fmt: *const c_char,
    ...
) -> c_int

Send a formatted AT command to the modem.

Supports all format specifiers of printf() as implemented by the selected C library. This function can return a negative value, zero or a positive value.

• fmt - Command format. @param … Format arguments.

Returns 0 On “OK” responses. @returns A positive value On “ERROR”, “+CME ERROR”, and “+CMS ERROR” responses. The type of error can be distinguished using * nrf_modem_at_err_type - . The error value can be retrieved using * nrf_modem_at_err - . Returns -NRF_EPERM The Modem library is not initialized. Returns -NRF_EFAULT * fmt - is * NULL - . Returns -NRF_EINVAL Bad format * fmt - . Returns -NRF_EAGAIN Timed out while waiting for another AT command to complete. Returns -NRF_ENOMEM Not enough shared memory for this request. Returns -NRF_ESHUTDOWN If modem was shut down.