Class-C sample

[Charly86]

Hi guys
have you got an example of class C device working?
I've done several tests and got only downlink when I send an uplink.

Is class C is working (I got last firmware at this day)
Thanks

[jmarcelino]

Hi @charly86

It should be. What's your network server? Is it sending the downlink on RX2 correctly, do you know which frequency/sf it is using?

[Charly86]

@jmarcelino
Thanks, I'm using this one https://github.com/gotthardp/lorawan-server with this configuration

[jmarcelino]

@charly86
Thanks, for the Gotthard server how are you triggering the Class C downlink? Are you specifying the correct port and time?

[Charly86]

@jmarcelino I'm using websocket for that, and with json, for class A I'm sending this and got downlink just after uplink (it works also with class C)

24/05/2018 16:16:11 Downlink: {"devaddr":"03128BC8","data":"0100"}

but for class C, when I send this nothing happens, even sending uplink just after to try to get downlink

24/05/2018 16:15:32 Downlink: {"devaddr":"03128BC8","data":"0100","time":"immediately"}

Anyway I'll try A timed one, may be I'm not doing things correctly

[Neuromystix]

@charly86 You'll need to specify also a port number for class C to work:

{"devaddr":"03128BC8","data":"0100", "port":2, "time":"immediately"}

[Charly86]

yeah I tried @jmarcelino port option while you were writing @Neuromystix , setting port and works ;-)

24/05/2018 16:59:16 Downlink: {"devaddr":"03128BC8","data":"0164","port":2, "time":"immediately"}

Lopy Side

Downlink received
Cmd=0x01
Value=100% Dac1=0.8

thanks all :-)

[Fulch36]

Can any of those who have now successfully got class C downlinks working please share some example code? I've been at this all week and like many others here: I can get downlinks in class A or C in the RX window after sending but never outside of it.

I'm also interested in some comments on how best to handle downlink messages, I can see some info on defining event driven callbacks but the docs don't make it clear whether this is supposed to be used for both LoRa and LoRaWAN. Otherwise I guess you'd just stop the socket from blocking and try to receive on that socket as part of a main loop, this seems a little messy but I'd just be happy to have it working.

[Francisco Oliveira]

What about class B devices? Is it necessary to make some code for Lopy (end node)?
Thank you.

[Gijs]

Class B is currently not supported in the pycom firmware for the Lopy.

You might be able to write some addition to the firmware to build it yourself, though I suspect it will be some work