STMICROELECTRONICS STM32L0 Ultra Low Power MCUs User Manual

: October 30, 2023
: STMicroelectronics

Table of Contents

STMICROELECTRONICS STM32L0 Ultra Low Power MCUs
Product Information
Product Usage Instructions
General information
Overview
AT commands
Examples
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

STMICROELECTRONICS STM32L0 Ultra Low Power MCUs

Product Information

The RYLR993 module is a LoRa SOC core-based device that uses the AT command set developed by REYAX for controlling the module. The module supports LoRaWAN communication and provides features such as activation by personalization, over-the-air activation, and long-range radio technology. The module also supports the use of keys, IDs, and EUIs for management purposes. Additionally, the module can be used to join and send data on the LoRa network and perform radio tests.

Product Usage Instructions

To use the RYLR993 module, the user must send AT commands to the module using a serial interface. The AT command set provided by REYAX consists of a series of short text strings that can be used to perform various operations such as joining the LoRa network, sending data to the network, and setting parameters. The user can also manage keys, IDs, and EUIs using the module.
For example, to join the LoRa network, the user can send the following command:

AT+JOIN
- To check the link status, the user can send:
AT+LINKC
- To send data to the LoRa network, the user can use the following command:
AT+SEND
- The RYLR993 module also supports radio test commands. To perform a radio test, the user can use the following command:
AT+RADIO=1
- For more detailed information on using the RYLR993 module, please refer to the product user manual.

General information

The document applies to the REYAX RYLR993 module that are LoRa SOC core-based devices.

Acronym	Definition
ABP	Activation by personalization
ETSI	European telecommunications standards institute
LoRa	Long range radio technology
LoRaWAN	LoRa wide-area network
OTAA	Over-the-air activation
RF	Radio frequency
RSSI	Received signal strength indicator
SNR	Signal-to-noise ratio

Overview

The following sections contain the interface description, the AT commands definition, and the description of some use cases and of the embedded software.

AT commands

The AT command set is a standard developed by REYAX to control module. The command set consists of a series of short text strings for performing operations such as joining, data exchange and parameters setting.
The AT commands are used to drive the LoRa module and to send data. The AT commands are sent through the UART.

Baud rate: 9600
Data: 8 bits
Parity: none
Stop: 1 bit
Flow control: none

All commands are of the form AT+XXX, with XXX denoting the command. The following command behaviors are available:

AT+XXX? provides a short help of the given command (such as AT+DEUI?).
AT+XXX is used to run a command (such as AT+JOIN).
AT+XXX=? is used to get the value of a given command (such as AT+CFS=?).
AT+XXX= is used to provide a value to a command (such as AT+SEND=2:Hello).

Output of the commands is provided on the UART. The output format is typically : $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $1$$

Considering:

is returned when help AT+XXX? and get AT+XXX=? commands are run.
and stands for the carriage return and line feed.
When no value is returned, then is not returned at all.
Every command, except ATZ (MCU reset), returns a status string, that is preceded and followed by
. Possible status are:
- OK: command run correctly without error.
- AT_ERROR: generic error
- AT_PARAM_ERROR: parameter of the command is wrong.
- AT_BUSY_ERROR: LoRa network is busy, so the command could not complete.
- AT_TEST_PARAM_OVERFLOW: parameter is too long.
- AT_NO_NETWORK_JOINED: LoRa network is not joined.
- AT_RX_ERROR: error detection during the reception of the command

More details on each command description and examples are given in the next sections. Each command preceded by # is provided by the host to the module, then the return of the module is printed.

AT_RX_ERROR

In case of AT_RX_ERROR, the command is corrupted when received in AT_Slave. Hence the command is not run.
However, in case of long commands, some spurious characters can still be in the queue, ready to be processed as a command. So, in case the user receives an AT_RX_ERROR, the user must first send to purge the queue, and then send back the same command so that it is processed.

Example $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $2$$

AT command overview

Command	Parameters	Description

Sets/gets the network root key

AT+APPKEY| [=2B:7E:15:16:28:AE:D2:A6:AB:F 7:15:88:09:CF:4F:3C]| ****

Sets/gets the application root key.

Command	Parameters	Description
AT+APPSKEY	[=2B:7E:15:16:28:AE:D2:A6:AB:F 7:15:88:09:CF:4F:3C]	****

Sets/gets the application session key.

AT+NWKSKEY| [=2B:7E:15:16:28:AE:D2:A6:AB:F 7:15:88:09:CF:4F:3C]| ****

Sets/gets the network session key.

mode = 1 (OTAA)

| ****

Joins the network.

AT+LINKC| –| Piggyback link check MAC command request to the next uplink
AT+SEND| [=port_nb:confirmedmode:data]

where confirmedmode = 0 or 1.

| ****

Sends packets to the network.

LoRa network management commands
AT+VER| [=?]| Gets the LoRaWAN version.
AT+ADR| [=adr_enable] where

adr_enable = 0 or 1

| ****

Sets/gets the adaptive data rate functionality.

None

| Sets the RF tone test.
AT+TRSSI| Sets the RF RSSI tone test.

AT+TCONF

| [=freq:pow:bw:sf:cr:lna:pa

:mod:paylen:freqdev

:lowdropt:BT] [=868000000:14:125:12:4/5:0:0:

1:255:0:0:0 for example

| ****

Sets/gets the config LoRa RF test.

AT+TTX| [=nb_packets_sent]| Sets the number of packets to be sent for PER RF Tx test.
AT+TRX| [=nb_packets_received]| Sets the number of packets to be received for PER RF Rx test.
Command| Parameters| Description
---|---|---
AT+CERTIF| [=mode] where mode = 0 (ABP) or

mode = 1 (OTAA)

| ****

Sets the module in LoRaWAN certification with join mode.

AT+TTH| [=, ,

,]

Event table
The table below details the events that the AT_Slave application sends as a notification to the host module.

Event	Return value	Description
+EVT:JOINED	None	Notifies an host module has been join on the gateway by

OTAA.

+EVT:JOIN FAILED

| ****

None

| Notifies the host module has not completed the join transaction (ID/Keys error, Tx not received by the gateway, Rx not received or not decrypted). In this case, the AT+JOIN must be recalled.
+EVT:| :::| Notifies the host module that an asynchronous frame has been received on a RX window with downlink frame.
+EVT:| RX_:::| Notifies the host module that an asynchronous frame has been received on a RX window with downlink parameters.

+EVT:

| ****

RX_:::

::

| Notifies the host module that an asynchronous frame has been received on a RX window with extended downlink parameters. This event replaces the previous event when at least one link check request (AT+LINKC) has been executed.
+EVT:SEND_CONFIRMED| None| Notifies the host module that a Tx frame has been acknowledge by the gateway.

General commands

AT

Description	Attention is used to check if the link is working properly.
Syntax	AT
Arguments	None
Response	None
Result code	OK

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $3$$

AT?

Description	Provides the short help of all supported commands.
Syntax	AT?
Arguments	None
Response	None
Result code	OK

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $4$$

ATZ – MCU reset

Description| The command generates a NVIC reset: resets the whole system including radio and microprocessor.
---|---
Syntax| ATZ
Arguments| None
Response| None
Result code| None (NVIC_Reset action)

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $5$$

The displayed keys by command above after ###### (DevEUI, AppEui, and DevAddr) are just informative and not a command response.

AT+VL – Verbose level

Description	Sets/gets the verbose level of the application.

Syntax

| AT+VL=

AT+VL=?

Arguments

| , the default is 1 (VLEVEL_L) 0: VLEVEL_OFF

1: VLEVEL_L

2: VLEVEL_M

3: VLEVEL_H

Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $6$$

AT+LTIME – Local time in UTC format

Description	Gets the local time in UTC format.
Syntax	AT+LTIME=?
Arguments	None
Response
Result code	OK

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $7$$

AT+OPMODE – Set operating mode

Description	Select LoRaWAN mode or REYAX RYLR998 proprietary mode
Syntax	AT+OPMODE=

AT+OPMODE=?

Arguments| , the default is 0 (LoRaWAN mode) 0: LoRaWAN mode

1: REYAX RYLR998 proprietary mode

*RYLR993 can’t set up the NETWORKID, only accept the default NETWORKID=18 of the RYLR998. When entry this mode please refer to the AT command of RYLR998.

Response|
Result code| OK

AT_PARAM_ERROR

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $8$$

Keys, IDs and EUIs management

AT+APPEUI – Application identifier

Description	Sets/gets the application EUI.

Syntax

| AT+APPEUI=

AT+APPEUI=?

Arguments| , 8-byte value separated by ”:” (hexadecimal format string)
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $9$$

AT+NWKKEY – Network root key

Description| Sets/gets the network root key. This key is used only in OTAA mode.
---|---

Syntax

| AT+NWKKEY=

AT+NWKKEY=?

Arguments| , 4-byte value separated by ”:” (hexadecimal format string)
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $10$$

AT+APPKEY – Application root key

Description| Sets/gets the application root key. This key is used only in OTAA mode.
---|---

Syntax

| AT+APPKEY=

AT+APPKEY=?

Arguments| , 16-byte value separated by ”:” (hexadecimal format string)
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $11$$

AT+APPSKEY – Application session key

Description

| Sets/gets the application session key. This key is used only in OTAA and APB modes. In OTAA mode, this key is replaced during the derivation process with the application root key and JoinAccept response information.
---|---

Syntax

| AT+APPSKEY=

AT+APPSKEY=?

Arguments| , 16-byte value separated by ”:” (hexadecimal format string)
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $12$$

AT+NWKSKEY – Network session key

Description

| Sets/gets the network session key. This key is used in OTAA and ABP modes. In OTAA mode, this key is replaced during the derivation process with the network’s root key and JoinAccept response information.
---|---

Syntax

| AT+NWKSKEY=

AT+NWKSEY=?

Arguments| , 16-byte value separated by ”:” (hexadecimal format string)
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $13$$

AT+DADDR – Device address

Description	Sets/gets the device address.

Syntax

| AT+DADDR=

AT+DADDR=?

Arguments|

, 4-byte value separated by ”:” (hexadecimal format string)
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $14$$

AT+DEUI – Device EUI

Description	Sets/gets the device EUI.

Syntax

| AT+DEUI=

AT+DEUI=?

Arguments| , 8-byte value separated by ”:” (hexadecimal format string)
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $15$$

AT+NWKID – Network ID

Description	Sets/gets the network ID.

Syntax

| AT+NWKID=

AT+NWKID=?

Arguments| , 1-byte decimal value from 0 to 127
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $16$$

Join and send data on LoRa network

Description	Join the LoRa network.
Syntax	AT+JOIN=

Arguments

|

0: join to a network by ABP 1: join to a network by OTAA

Response| +EVT:JOINED or +EVT:JOIN_FAILED

Result code

| OK

AT_PARAM_ERROR

AT+JOIN – Join LoRa network

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $17$$

AT+LINKC – Link check request

Description| Piggyback link check MAC command request to the next uplink. The DemodMargin and

NbGateways output information is provided into the extended Rx events +EVT:RX.

---|---
Syntax| AT+LINKC
Arguments| None
Response| None

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $18$$

AT+SEND – Send data to LoRa network

Description| Sends application packets with specified and AppPort and payload to LoRaWAN network.
---|---
Syntax| AT+SEND=::

Arguments

| • : application port to be transmitted

•

– 0: unconfirmed message

– 1: confirmed message

• : payload in hexadecimal format strings (maximum length is 242 bytes)

Response| +EVT:SEND_CONFIRMED

Result code

| OK

AT_PARAM_ERROR AT_DUTYCYLE_RESTRICTED AT_NO_NET_JOINED AT_BUSY_ERROR AT_CRYPTO_ERROR AT_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $19$$

LoRa network management

AT+VER – Firmware version

Description	Gets the version of the AT_Slave firmware.

Syntax

| APP_VERSION: Vx.y.z

MW_LORAWAN_VERSION: Va.b.c MW_RADION_VERSION: Vd.e.f

Arguments| None
Response|
Result code| OK

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $20$$

AT+ADR – Adaptive data rate functionality

Description	Sets/gets the adaptive data rate functionality.

Syntax

| AT+ADR=

AT+ADR=?

Arguments

|

• 0: ADR disabled

• 1: ADR enabled (default)

Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $21$$

AT+DR – Data rate

Description	Sets/gets the Tx data rate.

Syntax

| AT+DR=

AT+DR=?

Arguments| in the range [0,1,2,3,4,5,6,7]
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR

Note : To be able to set data rate, the ADR must be disabled.

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $22$$

AT+BAND – Active region

Description	Sets/gets the active region.

Syntax

| AT+BAND=

AT+BAND=?

Arguments

| : number corresponding to active regions

0: AS923 (RYLR993)

1: AU915 (RYLR993_AK)

5: EU868

6: KR920 (RYLR993_AK)

7: IN865 (RYLR993)

8: US915

9: RU864 (RYLR993_AK)

Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $23$$

AT+CLASS – LoRa class

Description	Sets/gets the LoRa class.

Syntax

| AT+CLASS=

AT+CLASS=?

Arguments| : must be A, B or C.
Response|

Result code

| OK

AT_ERROR AT_PARAM_ERROR AT_NO_CLASS_B_ENABLE AT_NO_NET_JOINED

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $24$$

AT+DCS – Duty cycle settings

Description	Sets/gets the duty cycle settings.

Syntax

| AT+DCS=

AT+DCS=?

Arguments

|

0: duty cycle disabled 1: duty cycle enabled

Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $25$$

AT+JN1DL – Join delay on Rx window 1

Description| Sets/gets the join accept delay between the end of the Tx and the join Rx window 1 (in ms).
---|---

Syntax

| AT+JN1DL=

AT+JN1DL=?

Arguments| : value in ms
Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $26$$

AT+JN2DL – Join delay on Rx window 2

Description| Sets/gets the join accept delay between the end of the Tx and the join Rx window 2 (in ms).
---|---

Syntax

| AT+JN2DL=

AT+JN2DL=?

Arguments| : value in ms
Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $27$$

AT+RX1DL – Delay of the Rx window 1

Description| Sets/gets the delay between the end of the Tx and the Rx window 1 (in ms).
---|---

Syntax

| AT+RX1DL=

AT+RX1DL=?

Arguments| : value in ms
Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $28$$

AT+RX2DL – Delay of the Rx window 2

Description| Sets/gets the delay between the end of the Tx and the Rx window 2 (in ms).
---|---

Syntax

| AT+RX2DL=

AT+RX2DL=?

Arguments| : value in ms
Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $29$$

AT+RX2DR – Data rate of the Rx window 2

Description	Sets/gets the Rx window 2 data rate (0-7 corresponding to DR_X).

Syntax

| AT+RX2DR=

AT+RX2DR=?

Arguments| : value in range [0:15]
Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $30$$

AT+RX2FQ – Frequency of the Rx window 2

Description	Sets/gets the Rx window 2 frequency.

Syntax

| AT+RX2FQ=

AT+RX2FQ=?

Arguments| : value in Hz
Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $31$$

AT+TXP – Transmit power

Description	Sets/gets the transmit power.

Syntax

| AT+TXP=

AT+TXP=?

Arguments| : must be in the range of the region activated in the range [0:15].
Response|

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $32$$

AT+PGSLOT – Ping slot

Description	Sets/gets the unicast ping slot periodicity.

Syntax

| AT+PGSLOT=

AT+PGSLOT=?

Arguments

| : periodicity to be transmitted, must be in the range [0:7]

Ping slot periodicity is 2< periodicity >, in seconds.

Response|

Result code

| OK

AT_PARAM_ERROR

Example $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $33$$

Radio test commands

AT+TTONE – RF tone test

Description	Starts a RF tone test.
Syntax	AT+TTONE
Arguments	None
Response	None

Result code

| OK

AT_BUSY_ERROR

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $34$$

AT+TRSSI – RF RSSI tone test

Description	Starts a RF RSSI tone test.
Syntax	AT+TRSSI
Arguments	None
Response	: value in dBm

Result code

| OK

AT_BUSY_ERROR

Example $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $35$$

AT+TCONF – LoRa RF test configuration

Description	Sets/gets the LoRa RF test configuration.

Syntax

| AT+TCONF=:::::::::<freq dev>::

AT+TCONF=?

Arguments

| •           : frequency in Hz
---|---
•           : Tx power in range [-9:22] dBm
•           :
–       LoRa (in kHz)
◦                                  0: 7.8125
◦                                  1: 15.625
◦                                  2: 31.25
◦                                  3: 62.5
◦                                  4: 125
◦                                  5: 250
◦                                  6: 500
–| FSK: 4800 to 467000 Hz
•           :
–       LoRa: SF5 to SF12 bit/s
–| FSK: 600 to 300000 bit/s
•           : LoRa only
–| 1: 4/5
–| 2: 4/6
–| 3: 4/7
–| 4: 4/8
•           : low-noise amplifier

– 0: Off

–| 1: On
•           : PA boost
–       0: Off
–| 1: On
•           : modulation
–| [0: FSK
–       1: LoRa
–       2: BPSK(Tx)
•           : payload length 1 to 256
•           : FSK only 4800 to 467000
•           : low DR optimization, LoRa only
–       0: Off
–| 1: On
–       2: Auto (1 when SF11 or SF12, 0 otherwise)
•           : FSK only
–       0: no Gaussian filter applied
–| 1: BT = 0,3
–| 2: BT = 0,5
–| 3: BT = 0,7
–| 4: BT = 1

Response

| • Freq= Hz

• Power= dBm

• Bandwidth= (=125000 Hz)

• SF=

• CR= (=4/5)

• LNA State=

• PA Boost State=

• Modulation

• Payload len= Bytes

•

• LowDRopt[0 to 2]=

•

---|---

Result code

| OK

AT_PARAM_ERROR

Note : , , and arguments are required by the command syntax but are not used on the B-L072Z-LRWAN1 platform.

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $36$$

AT+TTX – Packets to be sent for PER RF TX test

Description	Starts a PER RF TX test with the number of packets to be sent.
Syntax	AT+TTX=
Arguments
Response	None

Result code

| OK

AT_PARAM_ERROR AT_BUSY_ERROR

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $37$$

AT+TRX – Packets to be received for PER RF RX test

Description| Starts a PER RF RX test with the number of packets to be received.
---|---
Syntax| AT+TRX=
Arguments|
Response| None

Result code

| OK

AT_PARAM_ERROR AT_BUSY_ERROR

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $38$$

AT+TTH – RF Tx hopping test

Description| Starts RF Tx hopping test from Fstart to Fstop, with Fdelta steps.
---|---
Syntax| AT+TTH=,,,

Arguments

| • : frequency start (in Hz or MHz)

• : frequency stop (in Hz or MHz)

• : frequency bandwidth (in Hz)

• : number of packets to be sent

Response| None

Result code

| OK

AT_PARAM_ERROR AT_BUSY_ERROR

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $39$$

AT+CERTIF – Module in LoRaWAN certification with join mode

Description| Starts the module in LoRaWAN certification and with the choice of join mode.
---|---
Syntax| AT+CERTIF=

Arguments

|

0: join to a network by ABP 1: join to a network by OTAA

Response

| +EVT:JOINED

+EVT:JOIN_FAILED

Result code

| OK

AT_PARAM_ERROR

Examples: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $40$$

AT+TOFF – RF test

Description	Stops the RF test.
Syntax	AT+TOFF
Arguments	None
Response	None
Result code	OK

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $41$$

Information

AT+BAT – Battery level

Description	Gets the battery level (in mV).
Syntax	AT+BAT=?
Arguments	None
Response	: value is in mV
Result code	OK

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $42$$

AT+TEMP – Temperature

Description	Gets the temperature of module (in Celsius degree °C).
Syntax	AT+TEMP=?
Arguments	None
Response	: value is in Celsius degree.
Result code	OK

Example: $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $43$$

Examples

Here are some basic examples that describe how to use the AT commands. In the following sections, commands provided by the host are preceded by #, and comments are embraced with / /.

Join and send in unconfirmed mode $STMICROELECTRONICS-STM32L0-Ultra-Low- Power-MCUs-FIG- $43$$

Join and send in the confirmed mode $STMICROELECTRONICS-STM32L0-Ultra-Low- Power-MCUs-FIG- $44$$

Rx received data
It is possible to retrieve data sent from a specified port, when +EVT:RX is received.

Class B enables request
The example below shows how to do a Class B request through an AT command sequence. $STMICROELECTRONICS-STM32L0-Ultra-Low-Power-MCUs-FIG- $46$$