usb

Toit: jag monitor proxy

by

While developing on ESP32 boards at Lightbug on some of our newer products, I have repeatedly wanted to run Toit and Jaguar without WiFi enabled during a development setting. Either to have WiFi off to keep power consumption lower, turn off the default network so that I can make use of a secondary network or set up my own hotspot, and most recently, so that I can quickly iterate while using ESP-NOW.

Many months ago @floitsch told me about the --proxy option for the jag monitor command in Discord, and I finally have gotten around to trying it out this week. Here is how it went…

Using –proxy

The --proxy argument exists on the jag monitor command, which is essentially a slightly fancy serial / COM port monitor.

Adding this argument will attempt to proxy the device to the local network via your computer, rather than via the ESPs own WiFi. As a result, you can turn the WiFi off!

~ jag monitor --help
Monitor the serial output of an ESP32

Usage:
  jag monitor [flags]

Flags:
  -a, --attach            attach to the serial output without rebooting it
      --baud uint         the baud rate for serial monitoring (default 115200)
      --envelope string   name or path of the firmware envelope
  -l, --force-plain       force output to use plain ASCII text
  -r, --force-pretty      force output to use terminal graphics
  -h, --help              help for monitor
  -p, --port string       port to monitor (default "/dev/ttyUSB0")
      --proxy             proxy the connected device to the local network
Code language: Shell Session (shell)

Read more

Reading from USB COM port in go

by

If you want an easy copy and paste, no nonsense way to print the output of a COM PORT to the terminal in go, then have a look at the code at the bottom of this post.

Firstly, the go.bug.st/serial/enumerator package provides a very nice interface for getting details of connected devices, and includes more details than the example code in go.bug.st/serial that I found first time around.

Thanks to the toit devs for being responsive and helping me quickly figure out how I could make my ESP spit some USB content out over the COM port.

The code

In a nutshell is this:

  • Loops forever
  • Targets a specific device ID, such a 1a86:7523
  • Waits for it to appear as connected
    • Uses baud rate 115200
    • Opens the port
    • Prints all output received to the console

Read more

WSL2 COM port pass-through with usbipd (firewall issues)

by

I’ll start by saying that ultimately you want to read and follow the Connecting USB devices documentation for WSL.

However, a few things cropped up along the way that I think might be worth writing down for future me, and others.

Requirements

Firstly, you need to be on WSL2.

Next, install the USBIPD-WIN program.

winget install --interactive --exact dorssel.usbipd-winCode language: CSS (css)

Listing devices

In windows cmd or powershell, you can use usbipd list to list all devices. This should line up with what you see in Windows device manager if you open it.

Read more