Raspberry Piをbluetooth使用ルータとして活用する (Step3 bluetooth PAN)
bluetooth PAN
STEPその2でbluetoothのペアリングが出来ましたので、androidとのPAN(Personal Area Network)を構築します。 以前のバージョン(Raspbian 7 "Wheezy"またはRaspbian "squeeze")ではbluez-utilsのpandを使った方法がありましたが 新バージョン(Raspbian 8 "jessie")ではbluez-utilsが無くなってしまったようなので、スプリクトを用意してPANの構築を行います。
参考：My blog_title_here · Bluetooth PAN Network Setup with BlueZ 5.X
pi@raspberrypi:~ $ nano bt-pan
として、以下の内容をbt-panに記載します。(https://raw.githubusercontent.com/mk-fg/fgtk/master/bt-panから転記しています。)
#!/usr/bin/env python2
from __future__ import absolute_import, print_function
import os, sys, time, types, subprocess
import dbus, signal
### ~bluezutils.py
iface_base = 'org.bluez'
iface_dev = '{}.Device1'.format(iface_base)
iface_adapter = '{}.Adapter1'.format(iface_base)
iface_props = 'org.freedesktop.DBus.Properties'
class BTError(Exception): pass
def get_bus():
bus = getattr(get_bus, 'cached_obj', None)
if not bus: bus = get_bus.cached_obj = dbus.SystemBus()
return bus
def get_manager():
manager = getattr(get_manager, 'cached_obj', None)
if not manager:
manager = get_manager.cached_obj = dbus.Interface(
get_bus().get_object(iface_base, '/'),
'org.freedesktop.DBus.ObjectManager' )
return manager
def prop_get(obj, k, iface=None):
if iface is None: iface = obj.dbus_interface
return obj.Get(iface, k, dbus_interface=iface_props)
def prop_set(obj, k, v, iface=None):
if iface is None: iface = obj.dbus_interface
return obj.Set(iface, k, v, dbus_interface=iface_props)
def find_adapter(pattern=None):
return find_adapter_in_objects(get_manager().GetManagedObjects(), pattern)
def find_adapter_in_objects(objects, pattern=None):
bus = get_bus()
for path, ifaces in objects.iteritems():
adapter = ifaces.get(iface_adapter)
if adapter is None: continue
if not pattern or pattern == adapter['Address'] or path.endswith(pattern):
obj = bus.get_object(iface_base, path)
return dbus.Interface(obj, iface_adapter)
raise BTError('Bluetooth adapter not found')
def find_device(device_address, adapter_pattern=None):
return find_device_in_objects(get_manager().GetManagedObjects(), device_address, adapter_pattern)
def find_device_in_objects(objects, device_address, adapter_pattern=None):
bus = get_bus()
path_prefix = ''
if adapter_pattern:
if not isinstance(adapter_pattern, types.StringTypes): adapter = adapter_pattern
else: adapter = find_adapter_in_objects(objects, adapter_pattern)
path_prefix = adapter.object_path
for path, ifaces in objects.iteritems():
device = ifaces.get(iface_dev)
if device is None: continue
if device['Address'] == device_address and path.startswith(path_prefix):
obj = bus.get_object(iface_base, path)
return dbus.Interface(obj, iface_dev)
raise BTError('Bluetooth device not found')
### bt-pan
def main(args=None):
import argparse
parser = argparse.ArgumentParser(
description='BlueZ bluetooth PAN network server/client.')
parser.add_argument('-i', '--device', metavar='local-addr/pattern',
help='Local device address/pattern to use (if not default).')
parser.add_argument('-u', '--uuid',
metavar='uuid_or_shortcut', default='nap',
help='Service UUID to use. Can be either full UUID'
' or one of the shortcuts: gn, panu, nap. Default: %(default)s.')
parser.add_argument('--systemd', action='store_true',
help='Use systemd service'
' notification/watchdog mechanisms in daemon modes, if available.')
parser.add_argument('--debug',
action='store_true', help='Verbose operation mode.')
cmds = parser.add_subparsers( dest='call',
title='Supported operations (have their own suboptions as well)' )
cmd = cmds.add_parser('server', help='Run infinitely as a NAP network server.')
cmd.add_argument('iface_name',
help='Bridge interface name to which each link will be added by bluez.'
' It must be created and configured before starting the server.')
cmd = cmds.add_parser('client', help='Connect to a PAN network.')
cmd.add_argument('remote_addr', help='Remote device address to connect to.')
cmd.add_argument('-w', '--wait', action='store_true',
help='Go into an endless wait-loop after connection, terminating it on exit.')
cmd.add_argument('-c', '--if-not-connected', action='store_true',
help='Dont raise error if connection is already established.')
cmd.add_argument('-r', '--reconnect', action='store_true',
help='Force reconnection if some connection is already established.')
opts = parser.parse_args()
global log
import logging
logging.basicConfig(level=logging.DEBUG if opts.debug else logging.WARNING)
log = logging.getLogger()
dev_local = find_adapter(opts.device)
prop_set(dev_local, 'Powered', True)
log.debug( 'Using local device (addr: %s): %s',
prop_get(dev_local, 'Address'), dev_local.object_path )
wait_iter_noop = 3600
if opts.systemd:
from systemd import daemon
def wait_iter():
if not wait_iter.sd_ready:
daemon.notify('READY=1')
daemon.notify('STATUS=Running in {} mode...'.format(opts.call))
wait_iter.sd_ready = True
time.sleep(wait_iter.timeout)
if wait_iter.sd_wdt: daemon.notify('WATCHDOG=1')
wd_pid, wd_usec = (os.environ.get(k) for k in ['WATCHDOG_PID', 'WATCHDOG_USEC'])
if wd_pid and wd_pid.isdigit() and int(wd_pid) == os.getpid():
wd_interval = float(wd_usec) / 2e6 # half of interval in seconds
assert wd_interval > 0, wd_interval
else: wd_interval = None
if wd_interval:
log.debug('Initializing systemd watchdog pinger with interval: %ss', wd_interval)
wait_iter.sd_wdt, wait_iter.timeout = True, min(wd_interval, wait_iter_noop)
else: wait_iter.sd_wdt, wait_iter.timeout = False, wait_iter_noop
wait_iter.sd_ready = False
else: wait_iter = lambda: time.sleep(wait_iter_noop)
signal.signal(signal.SIGTERM, lambda sig,frm: sys.exit(0))
if opts.call == 'server':
brctl = subprocess.Popen(
['brctl', 'show', opts.iface_name],
stdout=open(os.devnull, 'wb'), stderr=subprocess.PIPE )
brctl_stderr = brctl.stderr.read()
if brctl.wait() or brctl_stderr:
p = lambda fmt='',*a,**k: print(fmt.format(*a,**k), file=sys.stderr)
p('brctl check failed for interface: {}', opts.iface_name)
p()
p('Bridge interface must be added and configured before starting server, e.g. with:')
p(' brctl addbr bnep-bridge')
p(' brctl setfd bnep-bridge 0')
p(' brctl stp bnep-bridge off')
p(' ip addr add 10.101.225.84/24 dev bnep-bridge')
p(' ip link set bnep-bridge up')
return 1
server = dbus.Interface(dev_local, 'org.bluez.NetworkServer1')
server.Register(opts.uuid, opts.iface_name)
log.debug('Registered uuid %r with bridge: %s', opts.uuid, opts.iface_name)
try:
while True: wait_iter()
except KeyboardInterrupt: pass
finally:
server.Unregister(opts.uuid)
log.debug('Unregistered server uuids')
elif opts.call == 'client':
dev_remote = find_device(opts.remote_addr, dev_local)
log.debug( 'Using remote device (addr: %s): %s',
prop_get(dev_remote, 'Address'), dev_remote.object_path )
try: dev_remote.ConnectProfile(opts.uuid)
except: pass # no idea why it fails sometimes, but still creates dbus interface
net = dbus.Interface(dev_remote, 'org.bluez.Network1')
for n in xrange(2):
try: iface = net.Connect(opts.uuid)
except dbus.exceptions.DBusException as err:
if err.get_dbus_name() != 'org.bluez.Error.Failed': raise
connected = prop_get(net, 'Connected')
if not connected: raise
if opts.reconnect:
log.debug( 'Detected pre-established connection'
' (iface: %s), reconnecting', prop_get(net, 'Interface') )
net.Disconnect()
continue
if not opts.if_not_connected: raise
else: break
log.debug(
'Connected to network (dev_remote: %s, addr: %s) uuid %r with iface: %s',
dev_remote.object_path, prop_get(dev_remote, 'Address'), opts.uuid, iface )
if opts.wait:
try:
while True: wait_iter()
except KeyboardInterrupt: pass
finally:
net.Disconnect()
log.debug('Disconnected from network')
else: raise ValueError(opts.call)
log.debug('Finished')
if __name__ == '__main__': sys.exit(main())
出来上がったら
pi@raspberrypi:~ $ sudo chmod 777 bt-pan
として、ファイルに実行権限をつけます。ここまで出来ればいよいよPANの構築
pi@raspberrypi:~ $ sudo ./bt-pan client YY:YY:YY:YY:YY:YY
で接続完了です。確認で
pi@raspberrypi:~ $ ifconfig bnep0 Link encap:イーサネット ハードウェアアドレス **:**:**:**:**:** inet6アドレス: ****:****:****:****:****:****/64 範囲:リンク inetアドレス:192.168.44.244 ブロードキャスト:192.168.44.255 マスク:255.255.255.0 UP BROADCAST RUNNING MULTICAST MTU:1500 メトリック:1 RXパケット:2 エラー:0 損失:0 オーバラン:0 フレーム:0 TXパケット:6 エラー:0 損失:0 オーバラン:0 キャリア:0 衝突(Collisions):0 TXキュー長:1000 RXバイト:410 (410.0 B) TXバイト:596 (596.0 B) (以下略)
DHCPでIPアドレスがもらえているようです。androidにpingを打って通信できるか確認します。
pi@raspberrypi:~ $ route カーネルIP経路テーブル 受信先サイト ゲートウェイ ネットマスク フラグ Metric Ref 使用数 インタフェース default 192.168.11.1 0.0.0.0 UG 0 0 0 eth0 default 192.168.11.1 0.0.0.0 UG 202 0 0 eth0 default 192.168.44.1 0.0.0.0 UG 203 0 0 bnep0 192.168.11.0 * 255.255.255.0 U 202 0 0 eth0 192.168.44.0 * 255.255.255.0 U 203 0 0 bnep0 pi@raspberrypi:~ $ sudo ping 192.168.44.1 PING 192.168.44.1 (192.168.44.1) 56(84) bytes of data. 64 bytes from 192.168.44.1: icmp_seq=1 ttl=64 time=449 ms 64 bytes from 192.168.44.1: icmp_seq=2 ttl=64 time=29.7 ms
ping に返事があればPANの確立は完了です。
