Using asyn as a TCP socket client in AD ioc

["Marco A. Barra Montevechi Filho via Tech-talk" <tech-talk at aps.anl.gov>]

Hello all,

Context:

I have an AreaDetector ioc which i want to communicate with a simple TCP socket. Since its heavily based on ADSim, i figured i would want to test the basic functionalities in ADSimDetector before trying the implementation in the actual ioc. I have my ADSimdetector from areaDetector-R3-11.

Since ADDriver inherits from asynNDArrayDriver which inherits from asynPortDriver, i figured i could use asynPortDriver's inherited methods to instantiate the socket client and asyn interface instead of creating everything again from scratch in c++.
So im inside areaDetector-R3-11/ADSimDetector/simDetectorApp/src/simDetector.cpp:1021 - that is, inside the simDetector class constructor - trying in all sorts of ways to create an asyn client to a socket... and failing.

What i managed to do so far: create an asynPort with drvAsynIPPortConfigure("PORT", "127.0.1.1:<test_port>") in the st.cmd file and, inside the cpp file:

#include <asynOctetSyncIO>
//(...) next line is inside the constructor
pasynOctetSyncIO->connect("PORT", 0, &pasynUserSelf, NULL);

but:

1 - im not even sure this is was i want to do: i think i would prefer to create the port and TCP connection already inside the cpp code instead of depending on cmd file;

2 - i dont know how to use the write method. I tried pasynOctetSyncIO->write(NULL, pasynUserSelf, "TEST\n", strlen("TEST\n"), sizeof("TEST\n")); and similar lines but i get:

../simDetector.cpp:1025:35: error: cannot convert ‘asynUser*’ to ‘const char*’ in argument passing
 1025 |     pasynOctetSyncIO->write(NULL, pasynUserSelf, "TEST\n", strlen("TEST\n"), sizeof("TEST\n"));

In the doxygen pages (https://epics-modules.github.io/master/asyn/R4-30/asynDoxygenHTML/classasyn_octet_client.html), i could only find asynOctetClient->write instead of asynOctetSyncIO->write and they do seem different. In this documentation (https://epics-modules.github.io/master/asyn/R4-43/asynDriver.html#asynOctet) it isnt clear to me what is the expected *drvPvt...

Questions (finally):

1 - Can i instantiate my asynPort inside the cpp code to avoid using drvAsynIPPortConfigure?
2 - How can i write/read to the connected port?
3 - Is there a minimal working example which i can follow?

Im sorry if the doubts are trivial but i really have been lost in the documentation for some time now. Thanks in advance,

Marco

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