Modem information

API documentation

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 GNSS 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/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:

enumerator MODEM_INFO_RSRP: Signal strength.

enumerator MODEM_INFO_CUR_BAND: Current LTE band.

enumerator MODEM_INFO_SUP_BAND: Supported LTE bands.

enumerator MODEM_INFO_AREA_CODE: Tracking area code.

enumerator MODEM_INFO_UE_MODE: Current mode.

enumerator MODEM_INFO_OPERATOR: Current operator name.

enumerator MODEM_INFO_MCC: Mobile country code.

enumerator MODEM_INFO_MNC: Mobile network code.

enumerator MODEM_INFO_CELLID: Cell ID of the device.

enumerator MODEM_INFO_IP_ADDRESS: IP address of the device.

enumerator MODEM_INFO_UICC: UICC state.

enumerator MODEM_INFO_BATTERY: Battery voltage.

enumerator MODEM_INFO_TEMP: Temperature level.

enumerator MODEM_INFO_FW_VERSION: Modem firmware version.

enumerator MODEM_INFO_ICCID: SIM ICCID.

enumerator MODEM_INFO_LTE_MODE: LTE-M support mode.

enumerator MODEM_INFO_NBIOT_MODE: NB-IoT support mode.

enumerator MODEM_INFO_GPS_MODE: GPS support mode.

enumerator MODEM_INFO_IMSI: Mobile subscriber identity.

enumerator MODEM_INFO_IMEI: Modem serial number.

enumerator MODEM_INFO_DATE_TIME: Mobile network time and date

enumerator MODEM_INFO_APN: Access point name.

enumerator MODEM_INFO_COUNT: Number of legal elements in the enum.

Functions

int modem_info_init(void)

Initialize the modem information module.

Return values: 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 values

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 values

0 – If the operation was successful. Otherwise, a (negative) error code is returned.

int modem_info_string_get(enum modem_info info, char *buf, const size_t buf_size)

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.

Parameters

info – The requested information type.
buf – The buffer to store the null-terminated string.
buf_size – The size of the buffer.

Returns

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

int modem_info_short_get(enum modem_info info, uint16_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.

Parameters

info – The requested information type.
buf – The short where to store the information.

Returns

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

int modem_info_name_get(enum modem_info info, char *name)

Request the name of a modem information data type.

Parameters

info – The requested information type.
name – The string where to store the name.

Returns

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

enum at_param_type modem_info_type_get(enum modem_info info)

Request the data type of the current modem information type.

Parameters

info – The requested information type.

Returns

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

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 values

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

uint16_t value: The retrieved value.

char value_string[100]: The retrieved value in string format.

char *data_name: The name of the information type.

enum 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

struct lte_param apn: Access point name (string).

struct lte_param rsrp: Received signal strength.

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.

Modem information

API documentation

API documentation 