[Nut-upsdev] Looking for examples of var TYPE descriptions

Glen Bakeman gbakeman at live.com
Fri Sep 3 19:59:12 BST 2021

Thank you for explaining that. That makes me feel better about my 
approach - maybe I misunderstood the programming of get_type, or the 
requirements of creating a variable in the driver - but this helps keep 
things simple on my end.

On 9/3/2021 12:54 AM, Roger Price wrote:
> On Thu, 2 Sep 2021, Glen Bakeman via Nut-upsdev wrote:
>> To give a little more background, I'm working on a program that, 
>> among other things, will parse the variable type(s) that are passed 
>> to it from a NUT server. I'd like to understand just how 
>> exotic/complicated a variable type can get. If that means ENUMs are 
>> just enum and nothing else, great - although from my understanding in 
>> the master branch of the nut-ups code, it seems possible that 
>> variables can mix and match when the server responds to such a query. 
>> I'm hoping someone can maybe provide a few examples of what the most 
>> complex variables look like, since I don't seem to have those on my end.
> There is no overall grammar for the "language" of the responses sent 
> by a NUT server to the client.  Each command received by the server 
> invites a response with a very limited grammar available for that 
> response.
> The command GET TYPE <upsname> <varname> returns the type, i.e. the 
> grammar of the response.  There is only one type per variable, and 
> there is only one grammar.  Choosing the grammar of the response 
> requires the server code to be able to handle all the possible types, 
> but the client will receive only one at a time.
> This is why the examples given are always simple, as in 
> command GET VAR su700 ups.status and response VAR su700 ups.status "OB 
> LB"
> However some testing showed:
> rprice at maria ~ nc localhost 3493
> GET TYPE Eaton ups.status
> TYPE Eaton ups.status NUMBER
> GET VAR Eaton ups.status
> VAR Eaton ups.status "OL"
> "OL" is not a NUMBER.  I cannot explain this.  Perhaps others can.
> Roger
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