def find_service(name=None, uuid=None, address=None):
if not address:
devices = discover_devices()
else:
devices = [address]
results = []
if uuid is not None and not is_valid_uuid(uuid):
raise ValueError("invalid UUID")
try:
for addr in devices:
try:
s = _bt.SDPSession()
s.connect(addr)
matches = []
if uuid is not None:
matches = s.search(uuid)
else:
matches = s.browse()
except _bt.error:
continue
if name is not None:
matches = [s for s in matches if s.get("name", "") == name]
for m in matches:
m["host"] = addr
results.extend(matches)
except _bt.error as e:
raise BluetoothError(*e.args)
return results
def get_RSSI(addr):
# Open an hci socket
hci_sock = bluez.hci_open_dev()
hci_fd = hci_sock.fileno()
# Try to open a connection to remote BT device
try:
bt_sock = bluez.SDPSession()
bt_sock.connect(addr)
except:
bt_sock.close()
hci_sock.close()
return None
# Get handle to ACL connection to remote BT device
reqstr = struct.pack("6sB17s", bluez.str2ba(addr), bluez.ACL_LINK,
"\0" * 17)
request = array.array("c", reqstr)
fcntl.ioctl(hci_fd, bluez.HCIGETCONNINFO, request, 1)
handle = struct.unpack("8xH14x", request.tostring())[0]
# Get RSSI
cmd_pkt = struct.pack('H', handle)
RSSI = bluez.hci_send_req(hci_sock, bluez.OGF_STATUS_PARAM,
bluez.OCF_READ_RSSI, bluez.EVT_CMD_COMPLETE, 4,
cmd_pkt)
RSSI = struct.unpack('b', RSSI[3])[0]
bt_sock.close()
hci_sock.close()
return RSSI