blendercam VS cncjs

I believe the Tool Change command is supported by: gSender or cncjs.

Get a raspberry pi, https://www.raspberrypi.org/, throw UGS https://winder.github.io/ugs_website/ or cnc.js https://cnc.js.org/ on it.

I use https://cnc.js.org/ to send g-code to the machine, this uses web page interface to set up the machine.

https://github.com/cncjs/cncjs/issues/431 ?

CNCjs - For CNC, same as above but for my CNC router, though I would never trust my CNC to run when I'm not physically close by ha ha so this hasn't been exposed to my OpenZiti network.

I think cncjs is what you're looking for: https://cnc.js.org/

Can you try with a different gcode sender software (cncjs), to see if you can Reset (red button) and Unlock (orange button)?

6 - Alternative, Save the gcode and use a g-code sender (example: cncjs). Notice: a g-code sender needs to know where is the 0,0 position/the start position, so in LightBurn select the start position "Current Position" and select the appropriate Job Origin. Save the gcode. On cncjs, move the laser to the "Job Origin" and zero both X and Y (the icon after the + on the Work Position). Click the blue Upload G-Code button, select your file and press the Play button to start the job.

Software: bCNC, cncjs, a couple others