## Introduction This documentation describes what each of the source files do / are for in the tmo_shell source folder. ![tmo_shell source files](https://devedge.t-mobile.com/uploads/image_2022_12_15_17_18_38_9e1eca3a77.png?updated_at=2022-12-16T19:26:47.072Z) ## Prerequisites - The [DevEdge IoT Developer Kit](/solutions/iotdevkit). - Setup a Zephyr development environment for the kit. - An IDE. - An understanding of the [tmo_shell](/documentation-hub/iot-developer-kit/interacting-with-the-kit-at-cli-via-tmo-shell). ## Source File Descriptions

File / Folder Name	Description	Example tmo_shell CLI Syntax
ek18	Contains all the kermit files / code.	`tmo kermit`
buzzer_test.c / h	Contains buzzer test code.	`tmo buzzer`
ca_certificate.h	Contains certificate of authority header information.	`tmo certs`
devcert.der	Binary encoded certificate for testing DTLS.	`tmo udp ...`
devkey.der	Binary encoded certificate for testing DTLS.	`tmo udp ...`
dfu_gecko.c / h	Updating firmware on SiLabs EFM32 Pearl Gecko 32-bit ARM Cortex M4 MCU in conjunction with a bootloader.	`tmo dfu ...`
dfu_murata_1sc.c / h	Updating firmware on Murata 1SC.	`tmo dfu ...`
dfu_rs9116w.c / h	Updating firmware on SiLabs RS9116W.	`tmo dfu ...`
digicert_ca.der	Binary encoded certificate for Digicert.	Not applicable.
echo-apps-cert.der	Binary encoded certificate for the T-Mobile echo server.	Not applicable.
echo-apps-key.der	Binary encoded certificate for the T-Mobile echo server, device side.	Not applicable.
entrust_g2_ca.der	Binary encoded certificate for Entrust.	Not applicable.
led_test.c	Contains code for LED testing. Manufacturing test for LEDs.	`led on pwmleds 0`
lets-encrypt-r3.der	Binary encoded certificate for Let's Encrypt.	Not applicable.
misc_test.c	Contains code for various sensors, I2C, modem, and Wi-FI commands. Manufacturing tests for various sensors and devices.	`sensor get TEMP_0` `tmo modem 1 imei`
servercert.der	Binary encoded CA for the T-Mobile DTLS server.	Not applicable.
tmo_adc.c / h	Contains code for using the Gecko ADC to read the battery voltage.	`tmo battery voltage`
tmo_battery_ctrl.c / h	Contains code for reading the battery level and converting to a percentage.	`tmo battery ...`
tmo_ble_demo.c / h	Contains code for using BLE and interfacing with the DevEdge IoT mobile app.	`tmo ble`
tmo_bq24250.c / h	Contains code for interfacing with the battery charger.	`tmo battery charger`
tmo_buzzer.c / h	Contains code for interfacing with the buzzer and playing tunes.	`tmo buzzer`
tmo_certs.c / h	Contains code for the DevEdge "cert store", i.e. certificate upload, download, etc.	`tmo certs`
tmo_dfu_download.c / h	Contains code for supporting DFU (device firmware update).	`tmo dfu`
tmo_file.c / h	Contains code for adding functionality to Zephyr file system services.	`tmo file`
tmo_gnss.c / h	Contains code for interfacing with the DevEdge GNSS chip.	`tmo gnssversion`
tmo_http_mock_socket.c	Contains code used for testing HTTP.	`tmo http ...`
tmo_http_request.c / h	Contains code for HTTP get URL.	`tmo http`
tmo_leds.h	Contains code to support LEDs, i.e. header information.	`led on pwmleds 0`
tmo_modem_edrx.c / h	Contains code for modem eDRX power saving mode.	`tmo modem 1 edrx`
tmo_modem_psm.c / h	Contains code for modem power saving mode.	`tmo modem 1 psm`
tmo_ping.c / h	Contains code for ICMP ping.	`tmo ping [-c count] [-s packetsize] [-t timeout] 2 t-mobile.com`
tmo_pm_sys.c / h	Contains code for system power management controls.	`tmo sys_pm`
tmo_pm.c / h	Contains code for device power management.	`tmo pm`
tmo_shell_main.c	Contains the main entry point for tmo_shell.	Not applicable.
tmo_shell.c / h	Contains code for many of submenus and functions in the tmo_shell.	`tmo`
tmo_smp.c / h	Contains code for the Bluetooth BLE SMP.	`tmo ble smp ...`
tmo_sntp.c / h	Contains code for SNTP to synchronize the dev kit's time with a given server.	`tmo sntp <server>`
tmo_web_demo.c / h	Contains code for interfacing to the T-Mobile DevEdge Web App.	`tmo json ...`
tmo_wifi.c / h	Contains code for interfacing to Wi-Fi.	`tmo wifi ...`

Description of tmo_shell Source Files