BLE 6LoWPAN边界路由器的多连接

Question

我正在努力使BLE连接与覆盆子pi 3。

当我建立1:1连接时，它工作得很好。

root@raspberrypi:~# hciconfig hci0 leadv
root@raspberrypi_SLAVE:~# echo "connect B8:27:EB:5D:C6:1E 1" > /sys/kernel/debug/bluetooth/6lowpan_control
root@raspberrypi:~# hcitool con
Connections:
        < LE B8:27:EB:5D:C6:1E handle 64 state 1 lm MASTER

root@raspberrypi:~# ping -6 -I bt0 2005::b827:ebff:fe5c:b7a0
PING 2005::b827:ebff:fe5c:b7a0(2005::b827:ebff:fe5c:b7a0) from 2005::1 bt0: 56 data bytes
64 bytes from 2005::b827:ebff:fe5c:b7a0: icmp_seq=1 ttl=64 time=164 ms
64 bytes from 2005::b827:ebff:fe5c:b7a0: icmp_seq=2 ttl=64 time=89.1 ms
64 bytes from 2005::b827:ebff:fe5c:b7a0: icmp_seq=3 ttl=64 time=62.9 ms
64 bytes from 2005::b827:ebff:fe5c:b7a0: icmp_seq=4 ttl=64 time=85.6 ms
64 bytes from 2005::b827:ebff:fe5c:b7a0: icmp_seq=5 ttl=64 time=58.9 ms
--- 2005::b827:ebff:fe5c:b7a0 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4005ms
rtt min/avg/max/mdev = 58.958/92.193/164.287/37.976 ms

但是当我连接2个或更多的设备时，它不工作！

root@raspberrypi:~# hciconfig hci0 leadv
root@raspberrypi_SLAVE2:~# echo "connect B8:27:EB:5D:C6:1E 1" > /sys/kernel/debug/bluetooth/6lowpan_control
root@raspberrypi:~# hcitool con
Connections:
        > LE B8:27:EB:C2:60:83 handle 65 state 1 lm SLAVE
        > LE B8:27:EB:5C:B7:A0 handle 64 state 1 lm SLAVE
root@raspberrypi:~# ping -6 -I bt0 2005::b827:ebff:fe5c:b7a0
PING 2005::b827:ebff:fe5c:b7a0(2005::b827:ebff:fe5c:b7a0) from 2005::1 bt0: 56 data bytes
^C
--- 2005::b827:ebff:fe5c:b7a0 ping statistics ---
28 packets transmitted, 0 received, 100% packet loss, time 28097ms

谁能告诉我如何使用BLE 6LoWPAN边界路由器连接多个设备。

Answer 1

我解决了这个问题。问题出在最新的Laspbian内核4.14.y版。在重建4.9.80-v7+之后，它工作得很好。

Answer 2

这篇文章已经快两年了，但它对我帮助很大！

在我的Raspberry Pis 4上运行Raspbian时也出现了完全相同的错误。

查看我的内核版本

uname -a

显示其版本为4.19.97-v7l+。

我发现有点奇怪，降级到4.9.80-v7+就可以解决这个问题，所以我简单地用以下命令升级到最新的内核5.4.40-v7l+

sudo rpi-update

我的BLE6LoWPAN连接工作正常！

因此，4.14和4.19之间的内核版本似乎在6lowPAN over BLE上有一些问题。在谷歌上找不到原因，但更新修复了它！