How to include message index in MQTT topic/poll?

[chrizzzp]

When polling an "indexed message" (not sure about the proper terminology here), e.g. the list of 10 entries of a devices error history, which is e.g. defined in the errors.inc like this:

*r,,,,,,"B503","01",,,,,,,,,
r,,errorhistory,Error history,,,,01,index,m,UCH,,,,,,errorhistory

...I can read the individual entries using ebusd from the command line like this:

ebusctl read -f -v -i 0 -c ctlv2 errorhistory
ebusctl read -f -v -i 1 -c ctlv2 errorhistory
...
ebusctl read -f -v -i 9 -c ctlv2 errorhistory

How would the following MQTT command have to be adapted to submit the specific message index (e.g. 1) to be polled by ebusd?

mosquitto_pub -t ebusd/ctlv2/errorhistory/get -m '?'