A while back, a colleague and I were working on an STM32 project, but our debugging setup quickly turned into a headache. Our ST-Link debugger was plugged into a desktop in the lab, while we preferred to work from our laptops—sometimes remotely. Each time we needed to flash firmware or troubleshoot a bug, we had to either physically switch computer
The Struggle with USB Passthrough and Workarounds
Initially, we tried a few workarounds:
- Remote Desktop Access – This worked for simple file transfers but wasn’t reliable for real-time debugging. The ST-Link wasn’t recognized properly, and the latency made debugging frustrating.
- USB over RDP – Some remote desktop solutions claim to support USB passthrough, but they often don’t handle specialized devices like ST-Link well. Connection drops were frequent.
- Virtual Machine USB Redirection – Since we also used VMs for development, we attempted to pass through the ST-Link to a VM. But USB passthrough in virtual environments is hit-or-miss, and ST-Link often fails to initialize.
- Manually Moving Between Computers – The old-school method. We’d flash firmware on one machine, then return to our development environment on another. This was inefficient.
None of these approaches provided the seamless, real-time access we needed, so we looked for a better solution.
The Simple Fix: Remote Access for ST-Link
Eventually, we tried a network-based USB sharing method using FlexiHub, which allowed us to connect to the ST-Link remotely as if it were plugged into our local machine. The setup was simple:
- Connected the ST-Link to a desktop in the lab.
- Installed FlexiHub on both the lab desktop and our laptops.
- Shared the ST-Link over the network.
- Accessed it remotely, debugging in real-time as if it were plugged in directly.
Unlike USB passthrough, this method worked without driver conflicts or connection drops, allowing us to flash firmware, use STM32CubeIDE, and debug over the network.
Why It Works Well for Remote Development
Using remote access for ST-Link debugging has made development more flexible and efficient:
- Work from Anywhere – No need to be physically near the hardware to debug.
- No More USB Passthrough Hassles – The debugger connects over the network without special VM settings.
- Multi-System Use – We can access the same ST-Link from different machines without moving hardware.
- Consistent Performance – Unlike remote desktop solutions, there’s no noticeable lag when flashing firmware or stepping through code.
Final Thoughts
For embedded developers working on STM32 projects, being tied to a single workstation for debugging can be limiting. After trying multiple unreliable methods, we found that remote access using a network-based solution simply worked better. It allowed us to stay productive without constantly moving between machines or dealing with finicky USB passthrough settings.
If you’ve ever struggled with using ST-Link in a remote setup, this approach is worth considering. It’s a small adjustment that can make development much smoother—especially when working in teams or from different locations.
