Smart Meter custom registers

[pkkrusty]

Have you looked for this feature in other issues and in the docs?

Is your feature request related to a problem? Please describe.
I'd like to iterate through a bunch of registers to map what is available (documentation is not correct for the inverter I am communicating with). So I tried to define the meter with the following, but it doesn't work. >M 1 +1,5,m,0,9600,modbus,1,10,%astr% Where I have built astr to be a normal Modbus command like r01037D500008

Is there already a method to do this?

Describe the solution you'd like
Poll consecutive registers programmatically instead of adjusting the script.

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
Add any other context or screenshots about the feature request here.

(Please, remember to close the issue when the problem has been addressed)

[gemu2015]

variable substitution is not supported in meter definition line.

define meter with a least one register like +1,5,m,0,9600,modbus,1,5, r01037D500008

then e.g. in >S send more register requests with

>S
; modify cstr programmatically 
cstr="r0103"+hn(v1)+hn(v2)+"0008"
sml(1 3 cstr)

you may then watch the responses in dump mode with sensor53 d1

[pkkrusty]

That works great, thanks.