databuffer protocol ID check

[Insomnia1437]

When I am using EVR to receive data buffer, I find that the data buffer receiver record is never processed.

After some debugging I found that the problem comes from below code which is inside evrMrmApp/src/devMrmBufRx.cpp

  //check protocol id
    if (paddr->proto != 0xff00 && paddr->proto != buf[0]) return;
    if (paddr->proto16 && paddr->proto16 != ntohs(((epicsUInt16*)buf)[0])) return;
    if (paddr->proto32 && paddr->proto32 != ntohl(((epicsUInt32*)buf)[0])) return;

My EVG sets the protocol ID to 1, but buf[0] value is 0. So the first if-condition is wrongly matched. When I use buf[3] rather than buf[0], it works fine. Is this a bug or am I just missing something?

The data buffer memory contents from my EVR:

epics> pciread 8 0x800 50

0x00000000 0100ff00 ff035700 00000000 0000e600
0x00000010 00000000 c4040e8e 8c00c000 b500beea
0x00000020 80041db2 68028387 40320003 48054e28

epics> pciread 32 0x800 50

0x00000000 00ff0001 000406ff 00000000 00e60000
0x00000010 00000000 8e0e04c4 00b6008c ea1e00bf
0x00000020 b21d0480 87830268 1c003240 214e1e48

[jerzyjamroz]

@Insomnia1437 , is this issue still valid? I use the defaults and it works fine:

file "mrmevrbufrx.db"
{pattern
{P, OBJ, PROTO, s}
{"\$(P)", "$(EVR):BUFRX", "0xff00", "-"}
}

[Insomnia1437]

Hi @jerzyjamroz , Later I realized that this problem is caused by version of mrfioc2. The EVG uses mrfioc2-2.0.3 (quite old) while my EVR uses mrfioc2-2.3.0. I think there exists some compatibility issues. We can close this issue.