Bluetooth LE

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==GATT==

The Generic Attribute Profile is the core BLE API. A server implements services, which are collections of one or more characteristics, and may have zero or more secondary services. A characteristic has a value, and optional descriptors. All three of these objects have UUIDs. Some UUIDs are assigned, and refer to standard objects. Others are vendor-defined. The UUIDs of a server's services, their characteristics, and their descriptors can be enumerated, but the client must give meaning to them (they are not self-describing).

The Generic Attribute Profile is the core BLE API. A server implements services, which are collections of one or more characteristics, and may have zero or more secondary services. A characteristic has a value, and optional descriptors. All three of these objects have UUIDs. Some UUIDs are assigned, and refer to standard objects. Others are vendor-defined. The UUIDs of a server's services, their characteristics, and their descriptors can be enumerated, but the client must give meaning to them (they are not self-describing). A characteristic can be read-only, write-only, or read-write, as defined by the server.

===<tt>bluetoothctl</tt>===

Discover local BLE devices' names and MAC addresses:

* <tt>scan le</tt>

Operating with GATT requires connecting, as specified using the server's MAC:

* <tt>connect MAC</tt>

Once connected, discover services and characteristics:

* <tt>gatt.list-attributes</tt>

Operating with a characteristic requires selecting it by UUID:

* <tt>gatt.select-attribute UUID</tt>

Read the selected characteristic:

* <tt>gatt.read</tt>

Write the selected characteristic:

* <tt>gatt.write DATA</tt>

DATA must be expressed as a series of bytes in the form <tt>0xHH</tt>, separated by spaces. This can be generated on the command line via e.g.:

* <tt>echo -n "here is some data" | xxd -p | sed -e 's/\(..\)/0x\1 /g'</tt>

[[CATEGORY: Networking]]

Bluetooth LE: Difference between revisions

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 ==GATT==
-The Generic Attribute Profile is the core BLE API. A server implements <i>services</i>, which are collections of one or more <i>characteristics</i>, and may have zero or more <i>secondary services</i>. A characteristic has a value, and optional <i>descriptors</i>. All three of these objects have UUIDs. Some UUIDs are assigned, and refer to standard objects. Others are vendor-defined. The UUIDs of a server's services, their characteristics, and their descriptors can be enumerated, but the client must give meaning to them (they are not self-describing).
+The Generic Attribute Profile is the core BLE API. A server implements <i>services</i>, which are collections of one or more <i>characteristics</i>, and may have zero or more <i>secondary services</i>. A characteristic has a value, and optional <i>descriptors</i>. All three of these objects have UUIDs. Some UUIDs are assigned, and refer to standard objects. Others are vendor-defined. The UUIDs of a server's services, their characteristics, and their descriptors can be enumerated, but the client must give meaning to them (they are not self-describing). A characteristic can be read-only, write-only, or read-write, as defined by the server.
+===<tt>bluetoothctl</tt>===
+Discover local BLE devices' names and MAC addresses:
+* <tt>scan le</tt>
+Operating with GATT requires connecting, as specified using the server's MAC:
+* <tt>connect MAC</tt>
+Once connected, discover services and characteristics:
+* <tt>gatt.list-attributes</tt>
+Operating with a characteristic requires selecting it by UUID:
+* <tt>gatt.select-attribute UUID</tt>
+Read the selected characteristic:
+* <tt>gatt.read</tt>
+Write the selected characteristic:
+* <tt>gatt.write DATA</tt>
+DATA must be expressed as a series of bytes in the form <tt>0xHH</tt>, separated by spaces. This can be generated on the command line via e.g.:
+* <tt>echo -n "here is some data" | xxd -p | sed -e 's/\(..\)/0x\1 /g'</tt>
+[[CATEGORY: Networking]]