6lowpan with MQTT on nrf52dk, how to connect?

[esonhon]

Hi,

I'm on nrf52dk platform.

I have flashed the MQTT publisher  firmware in IOT section provided in nRF5 SDK 14.2, config the ip address and auth info in code; established a border router according to https://devzone.nordicsemi.com/b/blog/posts/6lowpan-for-bluetooth-low-energy-on-openwrt , set up a MQTT broker on remote server with an ipV6 address.

In nRF5 sdk documents, it says:

1. Ensure that the MQTT broker address is set up correctly in the application.

2. Open a terminal program (for example PuTTY) to monitor the messages from the kit on the COM port.

3. Compile and program the application. Observe that the device is advertising.

4. Prepare the Linux router device by initializing the 6LoWPAN module.

5. Discover the advertising device by using the hcitool lescan command.

6. Connect to the discovered device from the Linux console by using the Bluetooth 6LoWPAN connect command.

7. Check if the connected state is reflected by the LEDs.

8. Prepare the IPv6 global prefix for the btX interface.

9. Press Button 1. Observe that the Mosquitto broker reports a new connection from the client "nrfPublisher".

   1. Observe that LED 2 is lit, which means that the connection is established. In case LED 2 is not turned on within 30 seconds, the procedure might have failed. This can be verified by observing a notification of MQTT_EVT_CONNACK with a failure (non-zero result code). Retry MQTT connection by pressing Button 1. Pressing the button before the procedure is complete, either with success or failure, will result in application assertion.

10. Press Button 2.

11. Observe that LED 4 is lit. This step may take several seconds to complete.

12. Observe the publish message and its acknowledgment logged on the Mosquitto broker.

    Now, I'm stuck on step 7, YES, the LED_1 stop blink to indicate ipv6 connection established, and I can ping6 the nrf52dk from the router, when push button_1 to connect, nothing happened. Perhaps becaurse I can not install radvd package on my router, this package never exist in the newest openwrt build. Any other way to proceed next?

[Håkon Alseth]

Hi,

 

I suspect that you haven't bridged your interfaces properly. As you indicate, radvd is deprecated (functionality is integrated into the native LEDE/openWRT stack), and you'll need to bridge the bt0 interface in order to get mqtt working properly.

There's two blog posts here on how to set this up with OpenWRT 15.05:

https://devzone.nordicsemi.com/b/blog/posts/openwrt-series-1-setting-up-tp-link-wdr4300-or-n75 <--- Sections 3 and 4 are relevant for you

https://devzone.nordicsemi.com/b/blog/posts/trying-openwrt-chaos-calmer-1505-rc1-on-raspberry-

Could you try this and see if you're able to get it working?

Cheers,

Håkon