Class-A immediate downlink with requested data


#1

Hi.

I want Class-A node to uplink a request for some data and get immediate response. I believe RX1 window is about 2 sec, so is it possible to fetch requested data on the server (some MQTT service waits for request, handles request and posts back) and send response immediately within RX1 window?


#2

Yes, this is possible, but the default RX1 window is 1 sec.

See also the following loraserver.toml configuration:

# Get downlink data delay.
#
# This is the time that LoRa Server waits between forwarding data to the
# application-server and reading data from the queue. A higher value
# means that the application-server has more time to schedule a downlink
# queue item which can be processed within the same uplink / downlink
# transaction.
# Please note that this value has influence on the uplink / downlink
# roundtrip time. Setting this value too high means LoRa Server will be
# unable to respond to the device within its receive-window.
get_downlink_data_delay="100ms"

#3

Do I need to change anything on the end node?