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• drp starts as a "high rate" drp
• has a command-line argument for the "low rate" readout group.  Can't get it from the connect-json since tprtrig doesn't participate in collection (rate is set with -p or -r or -e option, we think)
• whenever it sees a low-rate readout group bit in an event , (using "env" from dgram.readoutGroups()) blocks on the UDP fifo looking for the corresponding event-counter
  • could we see the low-rate readout group number in the connect_json?  It's there, but can we figure out which one it is.
• either matches, or times-out (but not with a timer, instead using later events or "disable" as described below)

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