RX Script Crashes with SF = 5 and SF = 6

[gorsheep]

Hello,

First of all, thank you for providing this great project! I've been using it to successfully implement LoRa communication. However, I've encountered issues when using spreading factors (SF) 5 and 6. Specifically, the RX script crashes, and packets are not decoded correctly under the following settings:

Transmitter (TX):

• samp_rate: 500 kHz
• bw: 250 kHz
• TX_gain: 100
• center_freq: 2.1 GHz
• sf: 6
• cr: 1

Receiver (RX):

• samp_rate: 500 kHz
• bw: 250 kHz
• RX_gain: 100
• center_freq: 2.1 GHz
• sf: 6
• cr: 1

I’ve attached the following screenshots for reference:

1. TX flow graph
2. RX flow graph
3. Console output showing that packets are not decoded correctly.

I have tried increasing the sampling rates (to 2x, 4x, and 8x the bandwidth) for both TX and RX, but the issue persists. The RX script still crashes when using SF = 5 or SF = 6. Other SF values (e.g., SF = 7) work as expected with the same bandwidth and sampling rate.

I noticed that a similar issue was reported about a year ago. The authors mentioned creating a new branch to address it, but I couldn’t find clear documentation or confirmation on whether this fix has been merged into the main branch, which I am currently using.

Could you please clarify if this issue has been resolved in the main branch? If not, are there any specific changes I should test from the branch created to address this problem?

Thank you for your time and assistance. Please let me know if further details or testing are needed!