GATT feature API for btshell

GATT(GENERIC ATTRIBUTE PROFILE) describes a service framework using the Attribute Protocol for discovering services, and for reading and writing characteristic values on a peer device. There are 11 features defined in the GATT Profile, and each of the features is mapped to procedures and sub-procedures:

Available commands

Parameters default values (if applicable) are marked red.

Configuration

Command	Parmeters	** Possible values**	Description
gatt-discover-characteristic			Discover GATT characteristics
	conn	[UINT16]	Connection handle
	uuid	[UINT16]	Characteristic UUID
	start	[UINT16]	Discovery start handle
	end	[UINT16]	Discovery end handle
gatt-discover-descriptor			Discover GATT descriptors
	conn	[UINT16]	Connection handle
	start	[UINT16]	Discovery start handle
	end	[UINT16]	Discovery end handle
gatt-discover-service			Discover services
	conn	[UINT16]	Connection handle
	uuid16	[UINT16]	Service UUID
gatt-discover-full			Discover services, characteristic and descriptors
	conn	[UINT16]	Connection handle
gatt-find-included-services			Find included services
	conn	[UINT16]	Connection handle
	start	[UINT16]	Discovery start handle
	end	[UINT16]	Discovery end handle
gatt-exchange-mtu			Initiate ATT MTU exchange procedure
	conn	[UINT16]	Connection handle
gatt-read			Read attribute
	conn	[UINT16]	Connection handle
	long	[0-1]	Long read
	attr	[UINT16]	Attribute handle
	offset	[UINT16]	Long read offset value
	uuid	[UINT16]	Characteristic UUID
	start	[UINT16]	Discovery start handle
	end	[UINT16]	Discovery end handle
gatt-notify			Send notification or indication to all subscribed peers
	attr	[UINT16]	Attribute handle
gatt-service-changed			Send Services Changed notification
	start	[UINT16]	Start handle
	end	[UINT16]	End handle
gatt-service-visibility			Set service visibility
	handle	[UINT16]	Service handle
	visibility	[0-1]	Service visibility
gatt-show			Show remote devices discovered databases structure
gatt-show-local			Show local database structure
gatt-write			Write attribute
	conn	[UINT16]	Connection handle
	no_rsp	[0-1]	Use Write Without Response
	long	[0-1]	Use Long Write procedure
	attr	[UINT16]	Attribute handle
	offset	[UINT16]	Long write offset value
	value	XX:XX:XX…	Data to write