It wasn't quite as easy as the last change, but relatively easy. Utterly untested, feedback welcome:
BETA for Ignition 8.1: v1.1.4.231931604
Some notes:
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When active, the driver alternates between the live connections on a per-batch basis. For this driver, a "batch" is a memory area subset of a single
system.opc.readValues()request,system.opc.writeValues()request, or subscription poll. (Coils with coils, discrete inputs with discretes, et cetera.) This is effectively load-balancing between the connections, though not deliberately so. (Batch sizes vary and are not considered in the toggling.) -
When a single connection breakage occurs, the batches that were queued to the now-broken connection will fail. For subscriptions, bad quality will appear for one subscription cycle. Non-subscription reads and any writes should be monitored for error results and retried.
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Only available for Modbus TCP, not any form of RTU.
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Device status will include "Degraded" or "Recovering" if the two connection states differ.
I probably won't have a chance to properly test this until next week. I thought y'all might like this preview.