Guides VS rust-raspi3-tutorial

There are a couple of very good guides for starting programs on Github https://github.com/thagrol/Guides

Have a look at this pdf [Github]

Obviously as bashrc is executed when you log in connecting twice at once (e.g. two ssh sessions, a VNC + SSH etc) will mean the program runs twice while other user accounts may not run the program at all - this may be what you want but if you are expecting it to run without you having to log in (or only run once) then have a look at the cron and boot pdf guides from Thagrol here [Github]

There are two good guides to automatically running commands at https://github.com/thagrol/Guides - look at the cron and boot PDFs

These is a full guide here (use the NAS document) but there are many web pages on SAMBA - I would look at the Pi Foundations notes here to install this and the third section to share the Pis folder.

I would use a systemd service - have a look at the two startup guides (cron / boot) at https://github.com/thagrol/Guides for more info on starting up programs.

One of the guys in the Pi forums created a couple of handy documents for starting programs - look at the cron and boot PDFs here (the Pi OS is a flavour of Debian so the majority of the process will be fine - some of the commands used could be different or Pi specific).

There is a set of guides here https://github.com/thagrol/Guides - have a look through the boot and cron ones for advice.

I think you can even loop mount the virtual USB stick's file system and read the file without virtually disconnecting the virtual USB stick. More info in this guide.

I use the BLEAK toolkit for Python and Bluetooth as my sensors are GATT servers. All data is sent over BLE broadcasts. Your sensors may be different (I would expect they are) as they could be giving a constant stream of data out. With luck they are not encrypted but here you could be on your own unless someone else has used them before. Starting up a program is documented in the cron and boot PDFs by Thagrol here - these are the no. 1 goto for this on the Pi.

If you really do not want any operating system (not a wise move in my mind) then you could look at the Rust on Bare Metal projects (such as this) or slightly lower level with C (such as this) but this is 'bleeding edge' and can require a fair bit of knowledge on the Pi hardware and ARM methods of working.