MQTT Publisher problem

[Amigo]

Hello! 

I have a problem with MQTT Publisher example on my nrf52840 DK.

here is my steps:

1. I edit nrf52840 mqtt example code with 

#define APP_MQTT_BROKER_PORT 1883

Edit my MQTT settings with:

memcpy(m_app_mqtt_client.broker_addr.u8, m_broker_addr.u8, IPV6_ADDR_SIZE);
m_app_mqtt_client.broker_port = APP_MQTT_BROKER_PORT;
m_app_mqtt_client.evt_cb = app_mqtt_evt_handler;
m_app_mqtt_client.client_id.p_utf_str = (uint8_t *)m_client_id;
m_app_mqtt_client.client_id.utf_strlen = strlen(m_client_id);
m_app_mqtt_client.p_password = NULL; //(mqtt_password_t*)"lzbHSKesAlEi";
m_app_mqtt_client.p_user_name = NULL; //(mqtt_username_t*)"ioibvutn";
m_app_mqtt_client.transport_type = MQTT_TRANSPORT_NON_SECURE;
m_app_mqtt_client.p_security_settings = NULL; //&m_tls_keys;

I made nrf52860's ipv6 address (FE80::25E:0DFF:FEAE:183E) with global prefix from MAC:

static const ipv6_addr_t m_broker_addr =
{
    .u8 =
    {0x20, 0x01, 0x0D, 0xB8,
    0x00, 0x00, 0x00, 0x00,
    0x02, 0x5E, 0x0D, 0xFF,
    0xFE, 0xAE, 0x18, 0x3E}
};

2. Download firmware

3. Install mosquitto on my Raspberry Pi 3 and leave it with default configurations without certs. Here is conf file:

persistence true
persistence_location /var/lib/mosquitto/
log_dest file /var/log/mosquitto/mosquitto.log
include_dir /etc/mosquitto/conf.d
pid_file /var/run/mosquitto.pid

# cafile /etc/mosquitto/certs/cert.crt
# certfile /etc/mosquitto/certs/cert.crt
# keyfile /etc/mosquitto/certs/newca.pem

# cafile /path/to/rootCA.pem
# certfile /path/to/server.crt
# keyfile /path/to/server.key

# require_certificate false
# tls_version tlsv1

4.Set a global IPv6 prefix as in this link

5. Strt mosquitto with console command "mosquitto -p 1883" and get back some lines (there my smartphone was connected to broker):

6.  i enabled 6lowpan:

modprobe bluetooth_6lowpan

echo 1 > /sys/kernel/debug/bluetooth/6lowpan_enable

7. Connect to my nrf52840:

echo "connect 00:5E:0D:AE:18:3E 1" > /sys/kernel/debug/bluetooth/6lowpan_control

8. Add global prefix to BT0:

ifconfig bt0 add 2001:db8::1/64
echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
service radvd restart

9. And try to ping  nrf52840: 

ping6 -I bt0 2001:DB8::25E:0DFF:FEAE:183E

And its pinging ok!

10. Then i started tshark:

tshark -i bt0 -Y "tcp.port==1883"

and try to monitor whats going on

After i pressed the connect button and get tshark log

Also i connect terminal to watch APP output log after the ipv6 link was established:

I always cant connect to broker. What is wrong with it?

[Håkon Alseth]

Hi,

 

I suspect your route is not setup properly between the bt0 and ethX interface (route -n -6 to show your current routes)

Could you try the steps in this thread (note the two routes in the accepted answer) ?

https://devzone.nordicsemi.com/f/nordic-q-a/15470/setting-up-lwm2m-server-with-nrf-iot-sdk/59085#59085

 

If that does not work, please post your radvd.conf file.

 

Best regards,

Håkon

[Amigo]

Thanks! I cheked it out.

I leave nrf52 broker ip as 2001:db8::1 in main.c

my radvd.conf file is:

interface bt0
{
AdvSendAdvert on;
prefix 2001:db8::/64
{
AdvOnLink off;
AdvAutonomous on;
AdvRouterAddr on;
};
};

On Rasp Pi i did next steps:

modprobe bluetooth_6lowpan
echo 1 > /sys/kernel/debug/bluetooth/6lowpan_enable
echo "connect 00:5E:0D:AE:18:3E 1" > /sys/kernel/debug/bluetooth/6lowpan_control

echo 1 > /proc/sys/net/ipv6/conf/all/forwarding
ifconfig bt0 add 2001:db8::1/64
service radvd restart

And it works