(apologies if this is a dupe, it looks like the first one got eaten)

I've just written a new driver for the programmable powersupplies sold by
RDTech on aliexpress and the branch is available at

They use Modbus RTU over USB or BT serial, and I've needed to make a couple
of minor changes to the existing modbus driver. I had to extend the reply
timeout, and I fixed a bug with some of the functions not returning an
sr_error_code value as required by the calling functions in modbus.c.
Neither change should impact existing drivers (I think the only one
currently is maynuo-m97.) The modbus fixes are in two separate commits on
the same branch.

It should implement everything that's supported by the sigrok API. However
there is an over-power protection register available alongside the
over-voltage and over-current ones, which sigrok does not currently
support. Is there any objection to adding the appropriate config keys for

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