Radio — Radiomaster Pocket

Handset

Item	Value
Model	Radiomaster Pocket
Firmware	EdgeTX
Screen	128×64 monochrome
Link	ExpressLRS (CRSF)
USB serial	`0483:5740`, serial `00000000001B`
USB mass storage	`0483:5720`
SD card	~120 MB FAT

The handset and the flight controller share vendor and product IDs — both are STM32 devices appearing as 0483:5740. Distinguish them by USB serial number, not by VID:PID. The FC is 3057397C3235; the radio is 00000000001B. Mistaking one for the other is easy and leads to confident, wrong conclusions.

Screen resolution matters for the Lua scripts: SCRIPTS/BF/radios.lua looks up a layout by resolution string and hard-fails with <resolution> not supported if there is no entry. 128x64 is supported, so the Pocket works. An unsupported handset throws that assertion immediately rather than misbehaving subtly.

USB modes

EdgeTX exposes three, switched at SYS → HARDWARE → USB Mode:

Mode	USB ID	Use
Serial	`0483:5740`	EdgeTX CLI
Storage (SD)	`0483:5720`	Copying files to the card
Joystick	—	Simulators

Set to Ask and the radio prompts on each connect.

The EdgeTX CLI

Serial mode gives a > prompt at 115200 baud. Available commands:

beep [<frequency>] [<duration>]
ls <directory>
read <filename>
readsd <start sector> <sectors count> <read buffer size (sectors)>
testsd
play <filename>
reboot [wdt]
set <what> <value>
serialpassthrough <port type> <port number>
help [<command>]

Note it is read-only for the filesystem — ls and read exist, but there is no write or copy. Putting files on the card requires Storage mode.

serialpassthrough is the route for flashing ExpressLRS hardware through the handset.

Unlike the flight controller, the EdgeTX CLI needs no special entry sequence — just connect and press Enter for a prompt. This is the opposite of Betaflight, which requires a bare # with no line ending.

SD card contents

Top level: FIRMWARE, LOGS, MODELS, RADIO, SCREENSHOTS, SCRIPTS, SOUNDS, BACKUP, edgetx.sdcard.version.

/SCRIPTS/TOOLS/ holds the tools that appear in the radio’s TOOLS menu:

elrsV3.lua — ExpressLRS configuration
TBSAgentLite.lua — TBS device config
WizardLoader.lua — model setup wizard
bf.lua, bfCms.lua — Betaflight, see TX Lua scripts
assorted games

A tool’s menu name comes from a marker in the script itself, not the filename:

local toolName = "TNS|Betaflight setup|TNE"

Sounds

SOUNDS/en/ is the voice pack for the selected language. Flight-mode and telemetry callouts sit in that directory under names of six characters or fewer (armed.wav, lowbat.wav, disarm.wav). SOUNDS/en/SYSTEM/ holds the fixed-name clips EdgeTX plays for its own events, plus the numbers and units it stitches together when speaking a telemetry value.

Every clip is 16-bit signed PCM, mono, 16 kHz. Stock alerts run roughly 0.6 to 1.5 s.

These are the system alerts worth knowing, because their filenames are fixed by EdgeTX and are not obvious from the radio’s menus:

File	Plays when
`SYSTEM/telemko.wav`	telemetry lost
`SYSTEM/telemok.wav`	telemetry recovered
`SYSTEM/thralert.wav`	throttle not at idle at power-on
`SYSTEM/swalert.wav`	a switch is out of position at power-on
`SYSTEM/hello.wav`	radio boot
`SYSTEM/rxko.wav`	receiver signal lost

Custom alerts

Those four alert clips are replaced with Super Mario Bros. effects — pipe for telemetry lost, power-up for telemetry recovered, small jump for the throttle warning, super jump for the switch warning. A distinct, recognisable sound per event beats four variations on the same synthesised voice, particularly for telemetry loss, which needs to register while flying.

Masters live in the workbench at radio-scripts/SOUNDS/, which mirrors the card’s layout, and are copied over in Storage mode. tools/mk_edgetx_sound.sh does the conversion: it resamples to 16 kHz mono 16-bit, trims leading and trailing silence, normalises to −3 dBFS and warns above 2 s.

Keep alert clips under about a second. A warning that outlasts the event it describes stops being information, and the startup warnings repeat until you clear them.

Link

ExpressLRS over CRSF, with telemetry enabled on the FC side (feature TELEMETRY). The CRSF link is what carries MSP to the Betaflight Lua scripts, which is why those work even when MSP over USB does not.