AT Monitor¶
Overview¶
The AT monitor sample demonstrates how to use the AT monitor library and define AT monitors to receive AT notifications from the Modem library.
The sample defines two AT monitors, one for network status notifications (+CEREG
) and one for received signal quality parameters notifications (+CESQ
) through the AT_MONITOR()
macro. The sample then subscribes to both notifications and switches the modem to function mode one to register to the network. While the device is registering to the network, the sample uses one of the AT monitors to determine if the registration is complete and monitors the signal quality using the other monitor. Once the device registers with the network, the sample reads the modem PSM mode status, enables it, and reads the PSM mode status again.
Requirements¶
Before you start, check that you have the required hardware and software:
- 1x nRF9151 Connect Kit
- 1x nano-SIM card with LTE-M or NB-IoT support
- 1x U.FL cabled LTE-M/NB-IoT/NR+ Flexible Antenna (included in the box)
- 1x USB-C Cable
- A computer running macOS, Ubuntu, or Windows 10 or newer
Set up your board¶
- Insert the nano-SIM card into the nano-SIM card slot.
- Attach the U.FL cabled LTE-M/NB-IoT/NR+ Flexible Antenna.
- Connect the nRF9151 Connect Kit to the computer with a USB-C cable.
Building the sample¶
To build the sample, follow the instructions in Getting Started Guide to set up your preferred building environment.
Use the following steps to build the AT Monitor sample on the command line.
-
Open a terminal window.
-
Go to
NCS-Project/nrf9151-connectkit
repository cloned in the Getting Started Guide. -
Build the sample using the
west build
command, specifying the board (following the-b
option) asnrf9151_connectkit/nrf9151/ns
.The
-p
always option forces a pristine build, and is recommended for new users. Users may also use the-p auto
option, which will use heuristics to determine if a pristine build is required, such as when building another sample.Note
This sample has Cortex-M Security Extensions (CMSE) enabled and separates the firmware between Non-Secure Processing Environment (NSPE) and Secure Processing Environment (SPE). Because of this, it automatically includes the Trusted Firmware-M (TF-M).
-
After building the sample successfully, the firmware with the name
merged.hex
can be found in thebuild
directory.
Flashing the firmware¶
Set up your board before flashing the firmware. You can flash the sample using west flash
:
Tip
In case you wonder, the west flash
will execute the following command:
Testing¶
After programming the sample, test it by performing the following steps:
-
Open up a serial terminal, specifying the correct serial port that your computer uses to communicate with the nRF9151 SiP:
- Start PuTTY.
-
Configure the correct serial port and click Open:
-
Press the DFU/RST button to reset the nRF9151 SiP.
-
Observe the output of the terminal. You should see the output, similar to what is shown in the following: