akestoridis / grc-ieee802154 Goto Github PK

Hi, I'm currently a researcher at Virginia Tech using this Scapy/GNU-RADIO setup on Ubuntu 22 VM (VMWARE 17)

I am using a USRP b205 mini over USB as my SDR.

I've successfully sniffed and piped packets into wireshark for over-the-air zigbee communication. Packets are viewable in wireshark and intact.

However, I'm running into an error that I can't seem to identify when trying to transmit. Working through the tests, I can send the test 'Hello World!' message and get the loop-back transmission in my pcap file. I can also send a generic 802.15.4 packet with no error over Scapy. However, when I attempt to send any Zigbee packet (the last step of testing), Scapy sends it over the UDP socket fine (the byte size is returned), however, immediately after socket.sendto. command, the transceiver flow graph terminates with 'return code -11'.

After some debugging, I think I've determined that this is because of the size of the packets being sent from scapy. The generic 802.15.4 packets are roughly 20 Bytes - significantly smaller than the Zigbee packets. For example, when I try sending 3-4 802.15.4 packets over Scapy for transmission successively, the flowgraph once again exits with the same return code. I've also seen that this code might mean a memory segmentation fault.

Have you seen a similar issue before? Any help would be greatly appreciated!

I've attached a screenshot below of my flowgraph connections when in Zigbee Transmission mode. I can provide any other screenshots as needed.

**Also if this is any help, when receiving packets, my terminal continuously outputs OOOOOoverflow errors from the USRP Source block, but still properly captures the packets. Internet says this is because my sampling rate is too high for my pc (Most likely because of CPU cores/RAM i've dedicated to the VM).