asynPortDriver: get all addresses for ASYN_MULTIDEVICE

["Dunning, Michael via Tech-talk" <tech-talk@aps.anl.gov>]

I've written an asynPortDriver for a TCP/IP-to-BitBus gateway which talks to power supply controllers.  The driver sends addressed messages to each controller and receives similar messages as responses.  The controllers may have non-sequential addresses in the [1, 200] range.

It works well with a single controller, and now I'm adding support for multiple controllers.  Since the gateway doesn't support multiple sockets, I'm using ASYN_MULTIDEVICE (multiple addresses using a single asyn port).

To poll the controllers, I need to loop over all addresses in my driver.  If I have sequential addresses that's easy, but mine may be non-sequential and I don't want to loop over non-existent addresses.  

Is there a way to get a list of all registered addresses for a given port from asynManager somehow?  By "registered" I mean an address that's present in a record and tied to a specific port, e.g.:

record(bo, "$(ps):StateSetpt") {
    field(DESC, "Power Supply On/Off")
    field(DTYP, "asynInt32")
    field(OUT,  "@asyn($(asynPort), $(address), 0) STATE_SETPT")
    field(ZNAM, "OFF")
    field(ONAM, "ON")
}

My first attempt would be to follow the asynReport (pasynManager->report) function which sets up a linked list and prints all addresses.  Am I on the right track?  Or is there something built-in that I missed?

Thanks,

Mike

Michael Dunning
SLAC National Accelerator Laboratory
2575 Sand Hill Road
Menlo Park, CA 94025
(650) 926-5200