Update README.md

PCAP Output/README.md

@@ -4,7 +4,9 @@ This uses LoRa packet forwarder to forward the LoRa packets to a localhost with
 
 ## Instructions
 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
@@ -12,31 +14,44 @@ This uses LoRa packet forwarder to forward the LoRa packets to a localhost with
     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.
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 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.
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 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.