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tilt-cloud4rpi/blescan.py

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# BLE iBeaconScanner based on https://github.com/adamf/BLE/blob/master/ble-scanner.py
# JCS 06/07/14
DEBUG = False
# BLE scanner based on https://github.com/adamf/BLE/blob/master/ble-scanner.py
# BLE scanner, based on https://code.google.com/p/pybluez/source/browse/trunk/examples/advanced/inquiry-with-rssi.py
# https://github.com/pauloborges/bluez/blob/master/tools/hcitool.c for lescan
# https://kernel.googlesource.com/pub/scm/bluetooth/bluez/+/5.6/lib/hci.h for opcodes
# https://github.com/pauloborges/bluez/blob/master/lib/hci.c#L2782 for functions used by lescan
# performs a simple device inquiry, and returns a list of ble advertizements
# discovered device
# NOTE: Python's struct.pack() will add padding bytes unless you make the endianness explicit. Little endian
# should be used for BLE. Always start a struct.pack() format string with "<"
import os
import sys
import struct
import bluetooth._bluetooth as bluez
LE_META_EVENT = 0x3e
LE_PUBLIC_ADDRESS = 0x00
LE_RANDOM_ADDRESS = 0x01
LE_SET_SCAN_PARAMETERS_CP_SIZE = 7
OGF_LE_CTL = 0x08
OCF_LE_SET_SCAN_PARAMETERS = 0x000B
OCF_LE_SET_SCAN_ENABLE = 0x000C
OCF_LE_CREATE_CONN = 0x000D
LE_ROLE_MASTER = 0x00
LE_ROLE_SLAVE = 0x01
# these are actually subevents of LE_META_EVENT
EVT_LE_CONN_COMPLETE = 0x01
EVT_LE_ADVERTISING_REPORT = 0x02
EVT_LE_CONN_UPDATE_COMPLETE = 0x03
EVT_LE_READ_REMOTE_USED_FEATURES_COMPLETE = 0x04
# Advertisment event types
ADV_IND = 0x00
ADV_DIRECT_IND = 0x01
ADV_SCAN_IND = 0x02
ADV_NONCONN_IND = 0x03
ADV_SCAN_RSP = 0x04
def returnnumberpacket(pkt):
myInteger = 0
multiple = 256
for c in pkt:
myInteger += struct.unpack("B", c)[0] * multiple
multiple = 1
return myInteger
def returnstringpacket(pkt):
myString = ""
for c in pkt:
myString += "%02x" % struct.unpack("B", c)[0]
return myString
def printpacket(pkt):
for c in pkt:
sys.stdout.write("%02x " % struct.unpack("B", c)[0])
def get_packed_bdaddr(bdaddr_string):
packable_addr = []
addr = bdaddr_string.split(':')
addr.reverse()
for b in addr:
packable_addr.append(int(b, 16))
return struct.pack("<BBBBBB", *packable_addr)
def packed_bdaddr_to_string(bdaddr_packed):
return ':'.join('%02x' % i for i in struct.unpack("<BBBBBB", bdaddr_packed[::-1]))
def hci_enable_le_scan(sock):
hci_toggle_le_scan(sock, 0x01)
def hci_disable_le_scan(sock):
hci_toggle_le_scan(sock, 0x00)
def hci_toggle_le_scan(sock, enable):
# hci_le_set_scan_enable(dd, 0x01, filter_dup, 1000);
# memset(&scan_cp, 0, sizeof(scan_cp));
# uint8_t enable;
# uint8_t filter_dup;
# scan_cp.enable = enable;
# scan_cp.filter_dup = filter_dup;
#
# memset(&rq, 0, sizeof(rq));
# rq.ogf = OGF_LE_CTL;
# rq.ocf = OCF_LE_SET_SCAN_ENABLE;
# rq.cparam = &scan_cp;
# rq.clen = LE_SET_SCAN_ENABLE_CP_SIZE;
# rq.rparam = &status;
# rq.rlen = 1;
# if (hci_send_req(dd, &rq, to) < 0)
# return -1;
cmd_pkt = struct.pack("<BB", enable, 0x00)
bluez.hci_send_cmd(sock, OGF_LE_CTL, OCF_LE_SET_SCAN_ENABLE, cmd_pkt)
def hci_le_set_scan_parameters(sock):
old_filter = sock.getsockopt(bluez.SOL_HCI, bluez.HCI_FILTER, 14)
SCAN_RANDOM = 0x01
OWN_TYPE = SCAN_RANDOM
SCAN_TYPE = 0x01
def parse_events(sock, loop_count=100):
old_filter = sock.getsockopt(bluez.SOL_HCI, bluez.HCI_FILTER, 14)
# perform a device inquiry on bluetooth device #0
# The inquiry should last 8 * 1.28 = 10.24 seconds
# before the inquiry is performed, bluez should flush its cache of
# previously discovered devices
flt = bluez.hci_filter_new()
bluez.hci_filter_all_events(flt)
bluez.hci_filter_set_ptype(flt, bluez.HCI_EVENT_PKT)
sock.setsockopt(bluez.SOL_HCI, bluez.HCI_FILTER, flt)
done = False
results = []
myFullList = []
for i in range(0, loop_count):
pkt = sock.recv(255)
ptype, event, plen = struct.unpack("BBB", pkt[:3])
# print "--------------"
if event == bluez.EVT_INQUIRY_RESULT_WITH_RSSI:
i = 0
elif event == bluez.EVT_NUM_COMP_PKTS:
i = 0
elif event == bluez.EVT_DISCONN_COMPLETE:
i = 0
elif event == LE_META_EVENT:
subevent, = struct.unpack("B", pkt[3])
pkt = pkt[4:]
if subevent == EVT_LE_CONN_COMPLETE:
le_handle_connection_complete(pkt)
elif subevent == EVT_LE_ADVERTISING_REPORT:
# print "advertising report"
num_reports = struct.unpack("B", pkt[0])[0]
report_pkt_offset = 0
for i in range(0, num_reports):
# if (DEBUG == True):
# print "-------------"
# #print "\tfullpacket: ", printpacket(pkt)
# print "\tUDID: ", printpacket(pkt[report_pkt_offset -22: report_pkt_offset - 6])
# print "\tMAJOR: ", printpacket(pkt[report_pkt_offset -6: report_pkt_offset - 4])
# print "\tMINOR: ", printpacket(pkt[report_pkt_offset -4: report_pkt_offset - 2])
# print "\tMAC address: ", packed_bdaddr_to_string(pkt[report_pkt_offset + 3:report_pkt_offset + 9])
# # commented out - don't know what this byte is. It's NOT TXPower
# txpower, = struct.unpack("b", pkt[report_pkt_offset -2])
# print "\t(Unknown):", txpower
# rssi, = struct.unpack("b", pkt[report_pkt_offset -1])
# print "\tRSSI:", rssi
# build the return string
beacon = {
'mac_addr': packed_bdaddr_to_string(pkt[report_pkt_offset + 3:report_pkt_offset + 9]),
'uuid': returnstringpacket(pkt[report_pkt_offset - 22: report_pkt_offset - 6]),
'major': "%i" % returnnumberpacket(pkt[report_pkt_offset - 6: report_pkt_offset - 4]),
'minor': "%i" % returnnumberpacket(pkt[report_pkt_offset - 4: report_pkt_offset - 2]),
'unknown': "%i" % struct.unpack("b", pkt[report_pkt_offset - 2]),
'rssi': "%i" % struct.unpack("b", pkt[report_pkt_offset - 1])
}
# print "\tAdstring=", Adstring
myFullList.append(beacon)
done = True
sock.setsockopt(bluez.SOL_HCI, bluez.HCI_FILTER, old_filter)
return myFullList
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