Hi!
I'm trying to do the TCP example with the nRF5_SDK_16.0.0_98a08e2, a nrf52840 DK board and a Raspberry Pi 3 B+ as a gateway but I got some problems.
For connecting the board to the Raspberry Pi I've followed the instructions from the tutorials (https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.iotsdk.v0.9.0/iot_getting_started.html?cp=7_4_2). My shell script derived from the tutorial looks like this:
#!/bin/sh # Mount debugfs file system mount -t debugfs none /sys/kernel/debug # Load 6LoWPAN module modprobe bluetooth_6lowpan # Enable 6LoWPAN echo 1 > /sys/kernel/debug/bluetooth/6lowpan_enable # Set IPv6 forwarding echo 1 > /proc/sys/net/ipv6/conf/all/forwarding # Run Router-Advertisement Daemon (radvd) service radvd restart # Look for available HCI devices # hciconfig # Reset HCI device hciconfig hci0 reset # Read BLE-Address from nRF51 timeout 3s hcitool lescan # Connect to the device echo "connect 00:81:1D:38:22:71 1" > /sys/kernel/debug/bluetooth/6lowpan_control sleep 3 # Add the IP prefix to the Bluetooth Interface bt0 ip address add 2001:db8::2/64 dev bt0 ifconfig bt0 # Restart radvd service service radvd restart echo "ping the BLE device using the global address" ping6 2001:db8:1::281:1dff:fe38:22:71 -c 5
Further, I have the following radvd.conf file:
interface bt0
{
AdvSendAdvert on;
prefix 2001:db8::/64
{
AdvOnLink off;
AdvAutonomous on;
AdvRouterAddr on;
};
};
Now if I run the script, it is not possible to ping the nrf52840 board. The output I get is as follows:
bt0: flags=4161<UP,RUNNING,MULTICAST> mtu 1280
inet6 fe80::b827:ebff:fef5:2a08 prefixlen 64 scopeid 0x20<link>
inet6 2001:db8::2 prefixlen 64 scopeid 0x0<global>
unspec B8-27-EB-F5-2A-08-78-B3-00-00-00-00-00-00-00-00 txqueuelen 1000 (UNSPEC)
RX packets 1 bytes 20 (20.0 B)
RX errors 0 dropped 2 overruns 0 frame 0
TX packets 12 bytes 1173 (1.1 KiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
ping the BLE device using the global address
ping: 2001:db8:1::281:1dff:fe38:22:71: Name or service not known
Also, if I send an echo request to discover all devices that are currently attached to the RasPi router, I only get responses from the bt0 interface an no response from the BLE device:
sudo ping6 -I bt0 ff02::1 PING ff02::1(ff02::1) from fe80::b827:ebff:fef5:2a08%bt0 bt0: 56 data bytes 64 bytes from fe80::b827:ebff:fef5:2a08%bt0: icmp_seq=1 ttl=64 time=0.154 ms 64 bytes from fe80::b827:ebff:fef5:2a08%bt0: icmp_seq=2 ttl=64 time=0.147 ms 64 bytes from fe80::b827:ebff:fef5:2a08%bt0: icmp_seq=3 ttl=64 time=0.123 ms
Another observation that I made is that every time approximately after 30 seconds the nrf52840 BLE device loses its BLE connection.
My Raspberry Pi has kernel version 4.19.66-v7+ and runs Raspbian Stretch.
I tried changing BLE_6LOWPAN_LEGACY_MODE in the sdk_config.h from 1 to 0 (according to this post with a similar problem: https://devzone.nordicsemi.com/f/nordic-q-a/44801/nrf-sdk-iot-mqtt-publisher-example-can-t-ping-from-bt0-and-interface-go-down) but it didn't change anything.
Even if I simply run the given instructions (see below) from the tutorial I cannot ping the board.
#!/bin/sh # Mount debugfs file system. mount -t debugfs none /sys/kernel/debug # Load 6LoWPAN module. modprobe bluetooth_6lowpan # Enable the bluetooth 6lowpan module. echo 1 > /sys/kernel/debug/bluetooth/6lowpan_enable # Look for available HCI devices. hciconfig # Reset HCI device - for example hci0 device. hciconfig hci0 reset sleep 2 # Read 00:AA:BB:XX:YY:ZZ address of the nRF5x device. timeout 3s hcitool lescan # Connect to the device. echo "connect 00:81:1D:38:22:71 1" > /sys/kernel/debug/bluetooth/6lowpan_control sleep 3 # Check if you have established a connection. ifconfig # Try to ping the device using its link-local address, for example, on bt0 interface. ping6 -I bt0 fe80::281:1dff:fe38:2271
When sending the ping to the link local address I do not get any response:
ping6: Warning: source address might be selected on device other than: bt0 PING fe80::281:1dff:fe38:2271(fe80::281:1dff:fe38:2271) from :: bt0: 56 data bytes ^C --- fe80::281:1dff:fe38:2271 ping statistics --- 27 packets transmitted, 0 received, 100% packet loss, time 26620ms
I searched the Nordic forums a lot, but in almost every post that I found, people were at least able to ping the BLE board.
If maybe somebody experienced the same problem and could help me I would be very glad.
