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zero. If timeout is > 0, then the BLE radio will listen for advertisements until the specified
value in seconds elapses. If timeout < 0, then there’s no timeout at all, and stop_scan()
needs to be called to cancel the scanning process.
Examples:
bluetooth.start_scan( 10 ) # starts scanning and stop after 10 seconds
bluetooth.start_scan( -1 ) # starts scanning indefinitely until bluetooth.stop_sc
an() is called
bluetooth.stop_scan()
Stops an ongoing scanning process. Returns
None
.
bluetooth.isscanning()
Returns
True
if a Bluetooth scan is in progress.
False
otherwise.
bluetooth.get_adv()
Gets an named tuple with the advertisement data received during the scanning. The tuple
has the following structure:
(mac, addr_type, adv_type, rssi, data)
mac
is the 6-byte ling mac address of the device that sent the advertisement.
addr_type
is the address type. See the constants section below for more details.
adv_type
is the advertisement type received. See the constants section below fro more
details.
rssi
is signed integer with the signal strength of the advertisement.
data
contains the complete 31 bytes of the advertisement message. In order to parse
the data and get the specific types, the method resolve_adv_data() can be used.
Example for getting
mac
address of an advertiser:
import ubinascii
bluetooth = Bluetooth()
bluetooth.start_scan( 20 ) # scan for 20 seconds
adv = bluetooth.get_adv() #
ubinascii.hexlify(adv.mac) # convert hexadecimal to ascii
bluetooth.get_advertisements()
Same as the
get_adv()
method, but this one returns a list with all the advertisements
received.
5.2.2.3 Bluetooth
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