Yes, I have seen that thread, and it has similar setup, afaict, the main difference is that I’m using E5-LE, but I guess it should not make much of a difference, since @msfujino is using the same output power. Also 915mhz instead of 868, witch also should not make a big difference. Same antennas as well, I think.
I am using STM32 directly, I think it is easier to use than arduino, so I don’t have the Arduino build environment for STM32. But it I can’t pursue this problem any other way, maybe I’ll have to set it up, to see if my problem is related to FW rather than HW.