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2020-06-04 03:12:25 +10:00
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This uses LoRa packet forwarder to forward the LoRa packets to a localhost with port 1700. Once packet forwarder is running, another process executes tcpdump that captures a loopback interface and outputs it as a pcap file. Afterwarads, we remove the Ethernet, IP and UDP headers (14+20+8) of the pcap file and set linktype to user (147). Finally, the edited pcap file is loaded to Wireshark, where the protocol is changed to LoRaWAN.
## Instructions
* Users should flash the correct configuration of LoRadar on the microSD card
`sudo apt-get update -y`
`sudo apt-get install -y bittwist`
`sudo apt-get install -y tcpdump`
`sudo tcpdump -s 0 -AUq port 1700 -w trial.pcap`
`bittwiste -I trial.pcap -O dump_dlt_user.pcap -M 147 -D 1-42`
1. Users should first flash the correct configuration of LoRadar on the microSD card.
2. Clone the `local_packet_forwader` directory to the Raspberry Pi.
3. Install the following dependencies.
```
sudo apt-get update -y
sudo apt-get install -y bittwist
sudo apt-get install -y tcpdump
sudo apt-get install -y screen
```
4. Create a screen session.
```
screen
```
5. Within this screen session, `cd` to the 'local_packet_forwarder' directory within Raspberry Pi. Execute the following to start capturing packets on port 1700 and outputting it as `capture.pcap`:
```
cd lora_pkt_fwd/
sudo tcpdump -s 0 -AUq port 1700 -w capture.pcap
```
6. Detach from the screen by pressing `ctrl + a + d` on the keyboard.
7. Start a new screen session by typing `screen` in the terminal.
8. `cd` to the 'local_packet_forwarder' directory within Raspberry Pi. Execute the following to start forwarding packets to localhost:
```
cd lora_pkt_fwd/
sudo chmod +x lora_pkt_fwd
sudo ./lora_pkt_fwd
```
9. To terminate the packet forwarder session, press `ctrl + c` on the keyboard and type `exit` in the terminal to end the screen session.
10. Navigate to the other screen by typing `screen -r -d` in the terminal.
11. End the packet capture session by pressing `ctrl + c` on the keyboard. You will now see a new `capture.pcap` file created in the directory.
12. Process the .pcap data to remove the unnecessary Ethernet, IP and UDP headers (14+20+8) of the pcap file and set linktype to user (147). This process will intake the `capture.pcap` file and output it as `processed_capture.pcap`.
```
bittwiste -I capture.pcap -O dump_dlt_user.pcap -M 147 -D 1-42
```
13. Open the `processed_capture.pcap` file in Wireshark.
14. Navigate to `Edit -> Preferences -> Protocols -> DLT_USER -> Edit...`.
15. Input `lorawan` as the Payload protocol, `14` as the header size, then click OK.
16. You will now see LoRaWAN fields under the frame information.