bt-le-central

bt-le-central is a tool for acting as a device in the LE central role by using the fuchsia.bluetooth.le and fuchsia.bluetooth.gatt2 FIDL APIs to discover and connect to peripherals and their services.

Test

fx test bt-le-central-unittests

Usage

Connect to peripherals with either the scan command or the connect command. Once a peripheral has been connected, a GATT REPL will start that enables you to interact with its services.

bt-le-central <command>

Commands

scan (--connect|--scan-count=N) [--name-filter=NAME] [--uuid-filter=UUID]

Scan for nearby devices and optionally connect to them.

Options

-h, --help

-s, --scan-count SCAN_COUNT

Number of scan results to return before scanning is stopped.

-c, --connect

Connect to the first connectable scan result.

-n, --name-filter NAME

Filter by device name.

-u, --uuid-filter UUID

Filter by UUID.

connect <peer-id>

Connect to a peer using its ID.

GATT REPL

The GATT REPL will start when a peripheral has connected. The following commands can be entered after the GATT> prompt.

Commands

help

Print help message.

list

List discovered services.

connect <index>

Connect to a service.

read-chr <id>

Read a characteristic.

read-long-chr <id> <offset> <max bytes>

Read a long characteristic.

write-chr [-w] <id> <value>

Write to a characteristic. Use the -w flag to write without response.

write-long-chr [-r] <id> <offset> <value>

Write to a long characteristic. Use the -r flag for a reliable write.

read-desc <id>

Read a characteristic descriptor.

read-long-desc <id> <offset> <max bytes>

Read a long characteristic descriptor.

write-desc <id> <value>

Write to a characteristic descriptor.

write-long-desc <id> <offset> <value>

Write to a long characteristic descriptor.

read-by-type <uuid>

Read a characteristic or descriptor by its UUID.

Example

GATT> read-by-type 9ec813b4-256b-4090-93a8-a4f0e9107733
all values read successfully: true
[id: 3, value: [0, 0, 0, 0, 0, 0]]

enable-notify <id>

Enable characteristic notifications.

disable-notify <id>

Disable characteristic notifications.

quit

Quit and disconnect the peripheral.

exit

Quit and disconnect the peripheral.