Modem information

The modem information library can be used by an LTE application to obtain specific data from a modem. It issues AT commands to retrieve the following data:

  • Signal strength indication (RSRP)

  • Current and supported LTE bands

  • Tracking area code, mobile country code, and mobile network code

  • Current mode and operator

  • The cell ID and IP address of the device

  • UICC state, SIM ICCID and SIM IMSI

  • The battery voltage and temperature level, measured by the modem

  • The modem firmware version

  • The modem serial number

  • The LTE-M, NB-IoT, and GPS support mode

  • Mobile network time and date

The modem information library uses the AT command parser.

Call modem_info_init() to initialize the library. To obtain a data value, call modem_info_string_get() (to retrieve the value as a string) or modem_info_short_get() (to retrieve the value as a short).

You can also retrieve all available data. To do so, call modem_info_params_init() to initialize a structure that stores all retrieved information, then populate it by calling modem_info_params_get(). To retrieve the data as a single JSON string, call modem_info_json_string_encode().

Note, however, that signal strength data (RSRP) is only available by registering a subscription. To do so, call modem_info_rsrp_register().

API documentation

Header file: include/modem_info.h
Source files: lib/modem_info/
group modem_info

Defines

MODEM_INFO_MAX_RESPONSE_SIZE

Largest expected parameter response size.

MODEM_INFO_JSON_STRING_SIZE

Size of the JSON string.

MODEM_INFO_RSRP_OFFSET_VAL

RSRP offset value.

MODEM_INFO_NETWORK_MODE_MAX_SIZE

Maximum string size of the network mode string

Typedefs

typedef void (*rsrp_cb_t)(char rsrp_value)

RSRP event handler function protoype.

Enums

enum modem_info

LTE link information data.

Values:

MODEM_INFO_RSRP

Signal strength.

MODEM_INFO_CUR_BAND

Current LTE band.

MODEM_INFO_SUP_BAND

Supported LTE bands.

MODEM_INFO_AREA_CODE

Tracking area code.

MODEM_INFO_UE_MODE

Current mode.

MODEM_INFO_OPERATOR

Current operator name.

MODEM_INFO_MCC

Mobile country code.

MODEM_INFO_MNC

Mobile network code.

MODEM_INFO_CELLID

Cell ID of the device.

MODEM_INFO_IP_ADDRESS

IP address of the device.

MODEM_INFO_UICC

UICC state.

MODEM_INFO_BATTERY

Battery voltage.

MODEM_INFO_TEMP

Temperature level.

MODEM_INFO_FW_VERSION

Modem firmware version.

MODEM_INFO_ICCID

SIM ICCID.

MODEM_INFO_LTE_MODE

LTE-M support mode.

MODEM_INFO_NBIOT_MODE

NB-IoT support mode.

MODEM_INFO_GPS_MODE

GPS support mode.

MODEM_INFO_IMSI

Mobile subscriber identity.

MODEM_INFO_IMEI

Modem serial number.

MODEM_INFO_DATE_TIME

Mobile network time and date

MODEM_INFO_COUNT

Number of legal elements in the enum.

Functions

int modem_info_init(void)

Initialize the modem information module.

Return Value
  • 0: If the operation was successful. Otherwise, a (negative) error code is returned.

int modem_info_params_init(struct modem_param_info *modem_param)

Initialize the structure that stores modem information.

Parameters
  • modem_param: Pointer to the modem parameter structure.

Return Value
  • 0: If the operation was successful. Otherwise, a (negative) error code is returned.

int modem_info_rsrp_register(rsrp_cb_t cb)

Initialize the subscription of RSRP values.

Parameters
  • cb: Callback function.

Return Value
  • 0: If the operation was successful. Otherwise, a (negative) error code is returned.

int modem_info_string_get(enum modem_info info, char *buf)

Request the current modem status of any predefined information value as a string.

If the data parameter returned by the modem is originally a short, it is still returned as a string.

Return

Length of received data if the operation was successful. Otherwise, a (negative) error code is returned.

Parameters
  • info: The requested information type.

  • buf: The string where to store the information.

int modem_info_short_get(enum modem_info info, u16_t *buf)

Request the current modem status of any predefined information value as a short.

If the data parameter returned by the modem is originally a string, this function fails.

Return

Length of received data if the operation was successful. Otherwise, a (negative) error code is returned.

Parameters
  • info: The requested information type.

  • buf: The short where to store the information.

int modem_info_name_get(enum modem_info info, char *name)

Request the name of a modem information data type.

Return

Length of received data if the operation was successful. Otherwise, a (negative) error code is returned.

Parameters
  • info: The requested information type.

  • buf: The string where to store the name.

enum at_param_type modem_info_type_get(enum modem_info info)

Request the data type of the current modem information type.

Return

The data type of the requested modem information data. Otherwise, a (negative) error code is returned.

Parameters
  • info: The requested information type.

int modem_info_params_get(struct modem_param_info *modem_param)

Obtain the modem parameters.

The data is stored in the provided info structure.

Parameters
  • modem_param: Pointer to the storage parameters.

Return Value
  • 0: If the operation was successful. Otherwise, a (negative) error code is returned.

struct lte_param
#include <modem_info.h>

LTE parameter data.

Public Members

u16_t value

The retrieved value.

char value_string[100]

The retrieved value in string format.

char *data_name

The name of the information type.

modem_info type

The information type.

struct network_param
#include <modem_info.h>

Network parameters.

Public Members

struct lte_param current_band

Current LTE band.

struct lte_param sup_band

Supported LTE bands.

struct lte_param area_code

Tracking area code.

struct lte_param current_operator

Current operator.

struct lte_param mcc

Mobile country code.

struct lte_param mnc

Mobile network code.

struct lte_param cellid_hex

Cell ID of the device (in HEX format).

struct lte_param ip_address

IP address of the device.

struct lte_param ue_mode

Current mode.

struct lte_param lte_mode

LTE-M support mode.

struct lte_param nbiot_mode

NB-IoT support mode.

struct lte_param gps_mode

GPS support mode.

struct lte_param date_time

Mobile network time and date

double cellid_dec

Cell ID of the device (in decimal format).

struct sim_param
#include <modem_info.h>

SIM card parameters.

Public Members

struct lte_param uicc

UICC state.

struct lte_param iccid

SIM ICCID.

struct lte_param imsi

Mobile subscriber identity.

struct device_param
#include <modem_info.h>

Device parameters.

Public Members

struct lte_param modem_fw

Modem firmware version.

struct lte_param battery

Battery voltage.

struct lte_param imei

Modem serial number.

const char *board

Board version.

const char *app_version

Application version.

const char *app_name

Application name.

struct modem_param_info
#include <modem_info.h>

Modem parameters.

Public Members

struct network_param network

Network parameters.

struct sim_param sim

SIM card parameters.

struct device_param device

Device parameters.