Send data from gateway to node

ChirpStack Application Server
#1

Good afternoon. Tell me is it possible to send to all devices in range of the base station a message with specific data. I have some device C-class. I need send them data.

1 Like
#2

Yeah its possible, you need to create a device profile with the class c activated, you need to get first a uplink packet (node to gateway) and then you can do downlinks (gateway to node), you say that you already have the class C devices, i have done a example with arduino and the RFM95 to create a class c device if you need it i leave a link to the gist, the first uplink is mandatory cause the lora server needs a last RX info in order to know what gateway will transmmit the information so the gateway who transmits will be the nearest to the node.

#3

Thank you. and how to initiate the transfer. For example I need to send a message (e.g. Hello World) to all the devices of class C in radius. Is there a team in the personal office Lora App Server or what else you can do.

#4

Please see Sending: https://docs.loraserver.io/lora-app-server/integrate/data/

#5

@brocaar @dronvip

Thanks for info.

I am new for downlink. Lora server is done and up links works fine.

from the above link i understood this is the topic to transmit data application/[applicationID]/node/[devEUI]/tx

example payload:
`{
“reference”: “abcd1234”, // reference which will be used on ack or error (this can be a random string)

“confirmed”: true, // whether the payload must be sent as confirmed data down or not

“fPort”: 10, // FPort to use (must be > 0)

“data”: “Qwerwesdfdsafgsdfg” // base64 encoded data (plaintext, will be encrypted by LoRa Server)

    }`
  • Above payload is enough or do we need any other additional parameters?
  • Can you please tell me how can i publish this topic or from where i can publish this data ?
  • My device is class C .How can i confirm that my end node/gateway received the data?

Really helpful if your giving your advice
Thanks in Advance!

#6

im also facing same problem ,i send downlink by mosquitto pub -t “topic” -m “msg” but it will not work so tell me how i successfully send downlink. please give response as soon as possible.

#7

hello, it would need to make a device listen in class c, and transmit in class a. Is it possible with your code?

#8

Yes but you need to decrypt the lorawan message in the device that has not been implemented

#9

for me just to hear that received a message is enough already, could you give me a light how to impliment the listen function and then do the transmission with the abp keys?