Request for *OPC? : Operation complete Check. about librevna HOT 3 CLOSED

Is the OPC just responding with a '1' every time? Commands are already queued within the TCP server so this '1' would only be returned once all previous commands have finished executing

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Yes, Although it differs from one manufacturer to another. I'm now implementing a mini circuits generator which has no OPC command, but it does not need to because every command get's an answer immediately so there is noting left in the buffer to wait for. (As far as I can tell at the moment, I just started.)

The interaction with the LibreVNA-GUI sometimes hangs if there is no data to be read. I have to check to be sure and if I'm able to, but I don't think other devices block my socket while waiting on an answer. But.. , I'll have to double check to answer this.

Keysight and "Rohde & Schwarz" devices also return errors as a tuple ( #number , ERROR ). This format might also be helpful for the LibreVNA. For these devices I always do a subsequent error check after every call. (SYST:ERR?)

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I still don't understand the need for the command completely (as the LibreVNA-GUI already returns an empty response after execution of each command) but as this is a really simple addition, I have added OPC command.
Sorry it took so long.

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