I have and executable python script on a remote raspberry pi that will get snow 
depth data from a MaxBotix TTL ultrasonic sensor (I hope)  I have tested from 
the “local” machine where weewx resides using pysftp and exectute the program.
The extension I’m writing merely has to connect via sftp, use the 
connection.execute() method and a list of strings is returned which I will 
process in the weewx extension to populate the new database.
I’m using a modified version of the MaxBotix sample script on the remote 
machine.  Modification was required for use with raspbian stretch on a RPi3
I am heavily modifying the mem extension that you, Vince, and Tom put together 
for my extension. 
thanks,
joe

> On Dec 22, 2017, at 2:11 PM, mwall <[email protected]> wrote:
> 
> btw, ssh is really awesome for remote access, and not just for interactive 
> shells.
> 
> you can limit a user to run only a single application
> 
> you can chroot a user into a jail that limits his/her access to the file 
> system
> 
> you can enable a remote user to have sudo rights, but only for specific 
> binaries or groups
> 
> it makes automation of tasks easy.
> 
> perhaps best of all, it is really easy to test.  the biggest gotchas are 
> usually when you put everything into a shell script - getting nested quotes 
> and variable expansion can be tricky.
> 
> m
> 
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