FreeRTOS RX retrieval windows to long

[mcserved]

Summary:

FreeRTOS has some drift, causing downlinks to fail. This relates to PR #202 and issue #187.

Steps to Reproduce:

1. Default value should show this in current consumption:
   
2. Change this:
   

   generic-node-se/Software/app/freertos_lorawan/conf/lorawan_conf.h

   Line 117 in 4063665

   #define lorawanConfigRX_MAX_TIMING_ERROR ( 50 )

   
   And this will produce this image:
   
   With this timing:

basic_lorawan	freertos_lorawan	(new) freertos
5s14ms	5s129ms	4s980ms
218ms	271ms	531ms
781ms	754ms	492ms
218ms	271ms	531ms

What do you see now?

Delayed RX windows.

What do you want to see instead?

RX windows closer to their appropriate values.

How do you propose to implement this?

Find the cause of the drift delaying the downlink.

Environment:

FreeRTOS

What can you do yourself and what do you need help with?

All

[elsalahy]

@marnixcro Can you please share some informations on your attempts to solve this?

[mcserved]

@marnixcro Can you please share some informations on your attempts to solve this?

I tried finding the cause with the clocks drifting, but the datasheet mentioned max drifts of only 1-2% on these clocks. I have not been able to find where in the firmware the downlink event gets triggered.

[NicolasMrad]

is this still relevant?