Since complete descriptor discovery is now performed inside gatt code,
there's no need to store end handle for characteristics and thus we can
remove disc_desc_cb_data.
This patch adds gatt_discover_desc() function which performs descriptor
discovery in a manner similar to gatt_discover_char(), i.e. it does
complete discovery procedure and returns list of descriptors found when
finished. For 16-bit UUIDs in addition to string UUID, short UUID is
provided.
It's also possible to specify single descriptor UUID to look for and
discovery procedure is interrupted as soon as UUID is found. This way
no more than one descriptor is returned which is useful when searching
for common descriptors like CCC.
Write callback is now attached to characteristics and descriptors
registered by Android app.
Transaction id is generated and stored in gatt_app together with
att_opcode
The Find Information Request is used to obtain the mapping of
attribute handles with their associated types. This allows a
client to discover the list of attributes and their types on
a server.
The Exchange MTU Request is used by the client to inform the server of
client's maximum receive MTU size and request the server to respond with
its maximum receive MTU size.
This adds database record about gatt's 'services changed'
characteristic. Proper flag in device is being set to mark it for
notification if gatt services are changed.
This adds placeholder data to device information service. To get
real data we should figure out the best way to get Android's system
properties and expose them to profiles for reading.
Now that we can split report map into items it's convenient to have it
printed with items structure preserved which makes it more useful for
debugging.
Up to 5 bytes are printed for each item which is enough for short items
and for long items continuation mark ('...') is printed if necessary.
This is because as for now there are no long item tags defined except
for some vendor defined thus we can safely "ignore" them and avoid
overly complicated code.
Report ID item in Report Descriptor is now detected by simply looking
for applicable item prefixes anywhere in data and does not take items
structure into consideration. This could lead to false-positive
detections in case value we look for is just part of item data, not an
actual item prefix.
As defined in Device Class Definition for HID (6.2.2.7), Report ID is
a short item with prefix 100001nn (binary) thus we do not need to do
complete parsing of Report Descriptor but only need to check items
prefixes in order to find Report ID items reliably.
This patch checks Report Descriptor item by item looking for item
prefix which matches Report ID, as defined in spec above.
