Unable to Connect Proxmark3 via ESP32-S2 USB to UDP Bridge

[sleepwalkera]

Hello,

I have been testing the ESP32-S2 firmware for the USB to UDP bridge functionality for Proxmark3 as described in this repository. Despite following the instructions, I am unable to establish a connection between the Proxmark3 client and the Proxmark3 device. Here are the steps I followed and the issues I encountered:

1. I successfully connected to the Wi-Fi hotspot created by the ESP32-S2 and was able to ping 192.168.4.1. An nmap scan confirmed that the UDP port 18888 on 192.168.4.1 is open.
2. However, when I attempt to connect to the Proxmark3 using the command pm3 -p udp:192.168.4.1:18888, the connection fails. The log output is as follows:

pm3 -p udp:192.168.4.1:18888
[=] Session log xxx.txt
[+] loaded `xxx/preferences.json`
[+] Using UART port udp:192.168.4.1:18888
[!!] 🚨 ERROR: cannot communicate with the Proxmark3

3. Both the client and device are running Proxmark3 firmware version v4.18589 - Aurora.

I would appreciate any guidance or suggestions to troubleshoot and resolve this issue. Thank you in advance for your help!

[wh201906]

Have you tried the TCP version?

[sleepwalkera]

I tested the TCP version, but had no luck. It appears that port 18888 is closed.

$ nmap 192.168.4.1 -p 18888
Starting Nmap 7.70 ( https://nmap.org ) at 2024-07-16 16:06 CST
Nmap scan report for 192.168.4.1
Host is up (0.018s latency).

PORT      STATE  SERVICE
18888/tcp closed apc-necmp

Nmap done: 1 IP address (1 host up) scanned in 13.08 seconds

[sleepwalkera]

I'm really interested in using this project. Could you please provide any suggestions?

[wh201906]

I don't have a valid ESP32-S2 now so I cannot test it.

It appears that port 18888 is closed.

This is unexpected. Did you connect the Proxmark3 hardware to the ESP32-S2?