Hardware Reference
In-Depth Information
Figure 2-4. Active and passive scanning
Advertising packet types can be classified according to three different properties. The
first is
connectability
:
Connectable
A scanner can initate a connection upon reception of such an advertising packet.
Non-connectable
A scanner cannot initiate a connection (this packet is intented for broadcast only).
The second property is
scannability
:
Scannable
A scanner can issue a scan request upon reception of such an advertising packet.
Non-scannable
A scanner cannot issue a scan request upon reception of such an advertising packet.
And the third is
directability
:
Directed
A packet of this type contains only the advertiser's and the target scanner's Bluetooth
Addresses in its payload. No user data is allowed. All directed advertising packets
are therefore connectable.
Undirected
A packet of this type is not targeted at any particular scanner, and it can contain
user data in its payload.
Table 2-1
shows the different advertising packet types and their properties.
