Bluetooth Lowe Energy

BTL----------

// Wikipedia  --------The first review paper to read when you counterred a new filed .

1, Bluetooth smart not back compatible -- it's not back the previous ,called classic bluetooth. Wether implemented  up to devices.

2, Android 4.3(api 18)and later

3, defined parameter:

distance:　　100m

over the air rates:　　　　1Mb/s

app rate:　　0.27Mb/s = 270kb = 33 KB/s

security:　　application layer user defined

latency:　　6ms(min time send a data is 3ms)

voice capable:　　no

power consumption:　　0.01 to 0.5W

peak current consumption　　15mA

4, Generic Attribute Profile (GATT).

The Bluetooth SIG have reserved a range of UUIDs (of the form xxxxxxxx-0000-1000-8000-00805F9B34FB ^[34]) for standard attributes.For efficiency, these identifiers are represented as 16-bit or 32-bit values in the protocol, rather than the 128 bits required for a full UUID. For example, the Device Information service has the short code 0x180A, rather than 0000180A-1000-... . The full list is kept in the Bluetooth Assigned Numbers document online

SIMPLE _____A_process___OF__BT_________________________________________________________

1, check if bt support

2, enable if bt closed

3,scanning

　　1) paring request:  have a shared link-key that can be used for authentication, and are capable of establishing an encrypted connection with each other

　　2) connecting : the devices currently share an RFCOMM channel and are able to transmit data with each other

Cause: peer not authenticated error.

感觉国外的牛人就是每天没事看别人提问。。。