Failed to send downlink messages

QN1 · July 29, 2020, 2:40pm

Issue: downlink packet from app server [node red] to node failed

Setup: rak 7258 built in lora server with external MQTT Integration

LoRa® Server: built in lora server

Details: i m using heltec wirekess stick with rak 7258 gateway.
using built in lora server of gateway with external MQTT Integration.
i am trying to send some data from node to app server which is node red instance. and trying to turn ON/OFF led of node from node red.
node is configured in ABP mode, Class C.
i am successfully recieving node data in node red however downlink not working.
i am using ESP32Lorawan_master Library.
if i send downlink data from gateway under appliction , node is gatting ON/OFF command. if i send same data from node red, node not responding.
no downlink data received in live device data.

Nicholas · July 30, 2020, 1:18am

Dear，
What method is used to send downlink data? When you send the downlink, can you receive it on the server？

QN1 · July 30, 2020, 6:27am

i am sending data from node red. sending “31” to turn ON led and “32” to turn OFF.
YES i am receiving this data in system log

Nicholas · July 30, 2020, 6:29am

Dear，

Great！You have solved your problem?

QN1 · July 30, 2020, 7:52am

nop…
gateway receiving from app server but gateway not forwarding to node. there is no downlink packet in live device data window.
if i manually send this data from gateway downlink panel, then live device data show downlink packet and node responding accordingly…however this is not happening from node red to end node.

Nicholas · July 30, 2020, 7:58am

Dear,

I can see that the server has sent data normally, but the node has not received it. This is very strange. Maybe you can try to test with our node to see if it can receive successfully.

QN1 · July 30, 2020, 8:07am

i tested node. and its working good if i send data manually.

Nicholas · July 30, 2020, 8:13am

Dear,

But when you send it through MQTT, he will not be able to receive it normally, right?

QN1 · July 30, 2020, 8:24am

yes this is the issue…

Nicholas · July 30, 2020, 8:39am

Dear,

Can you tell me which mqtt server you use?

QN1 · July 30, 2020, 10:46am

Mosquito …

Nicholas · July 30, 2020, 10:55am

Dear，

You must ensure that these parameters are correct and the delivery format is correct.

E.g：mosquitto_pub -h 172.31.204.46 -t ‘application/2/device/2222222222222222/tx’ -m ‘{“confirmed”: true,“data”: “SGVsbG8=”,“fPort”: 10}’

QN1 · October 26, 2020, 1:37pm

Hi Dear.
this is my downlink topic. is that correct…?

Nicholas · October 27, 2020, 4:00am

Dear QN，

You need recover the setup!
downlink:application/{{application_ID}}/device/{{device_EUI}}/tx

Best regards！

QN1 · October 27, 2020, 3:59pm

dear i m sorry . i did not understand what you want to say…
kindly explain briefly…
regads…

Nicholas · October 28, 2020, 1:21am

Dear QN，

I want you to change your uplink topic and downlink topic！

uplink topic：application/{{application_ID}}/device/{{device_EUI}}/rx

downlink topic：application/{{application_ID}}/device/{{device_EUI}}/tx

Best regards！

QN1 · November 2, 2020, 4:34pm

dear i tried several methods of topic. with curly braces uplink topic dosent work. and downlink topic is no hope. with curly braces and without curly braces…there is no output…

Nicholas · November 3, 2020, 1:27am

Dear QN，

Perhaps you can change the subscribed topic to #

# for subscribing to everything

Best regards！