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MQTT-SN not working with RaspPi_OT_Border_Router_Demo_v3.1.0-1.alpha

Hi

it looks like my MQTT-SN is not working.

I am trying to run MQTTSN Example in nRF52840 devices.  
https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.threadsdk.v0.11.0%2Fthread_mqttsn_example.html

I am using Development boards MDBT50Q-DB-40 from Raytac
https://www.raytac.com/product/ins.php?index_id=81
I verified the LED pins and Switches. P0.11 - SW1, P0.12 - SW2, P0.24 - SW3, P0.25 - SW4. P0.13 - LED1, P0.14 - LED2, P0.15 - LED3, P0.16 - LED4

I have set up border router using nRF52840-DK. Working on UART. Followed https://infocenter.nordicsemi.com/index.jsp?topic=%2Fsdk_tz_v3.1.0%2Fthread_border_router.html

I can able to ping 64:ff9b::0808:0808 using each Thread device on the network. Received 16 bytes from 64:ff9b:0:0:0:0:808:808: icmp_seq=1 hlim=56 time=55ms 

I get below response from Rpi


pi@raspberrypi:~ $ sudo wpanctl status
wpan0 => [
        "NCP:State" => "associated"
        "Daemon:Enabled" => true
        "NCP:Version" => "OPENTHREAD/20180926-01143-g8a1992e2; NRF52840; Dec 10                                                                                                                                                              2019 22:48:00"
        "Daemon:Version" => "0.08.00d (; Jun 11 2019 09:10:53)"
        "Config:NCP:DriverName" => "spinel"
        "NCP:HardwareAddress" => [F4CE36E039BD4848]
        "NCP:Channel" => 15
        "Network:NodeType" => "router"
        "Network:Name" => "OpenThreadDemo"
        "Network:XPANID" => 0x1111111122222222
        "Network:PANID" => 0x1234
        "IPv6:LinkLocalAddress" => "fe80::1cb9:481c:f882:b75d"
        "IPv6:MeshLocalAddress" => "fd11:1111:1122:0:95c1:59d8:b2f8:6f81"
        "IPv6:MeshLocalPrefix" => "fd11:1111:1122::/64"
        "com.nestlabs.internal:Network:AllowingJoin" => false

I have modified the etc/aho-mqtt-sn-gateway.conf

Broker Name: mqtt.eclipse.org
GatewayUDP6Broadcast = ff03::1

I am not getting what I am missing here. Any help would be appreciable.

Thanks,

Naveen

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