Magnulas
commented
6 years ago I've encountered this issue as well. The root cause seems to be that when messageSize is larger than the buffer size on line 213 in opc_tcp_async.cpp only a partial message will be stored in the buffer.
When the buffer is later read at line 51 in binary_serialization.h this will eventually lead to the error, since the size read at line 39 will make the for loop try and deserialize more data than is available in the buffer.
Hi I test opcua-server with the "example_server.cpp" and I add 1000 variables to the server. The code is as below. Node vars[1000]; for (i = 0; i < 1000; i++) { sprintf(varsname, "myvar%03d", i); vars[i] = newobject.AddVariable(idx, varsname, Variant(8)); }
When I add all the 1000 variables to the Data Access View of UaExpert client(a free opcua client) to monitor them, the server shows the error message as below.
_opc_tcp_async| Waiting for client connection at: 0.0.0.0:4841 expecting 4 received: 3 opc_tcpasync| Failed to process message. Not enough data was received from channel.
I enlarge the size of buffer in OpcTcpConnection::OpcTcpConnection() in which the default is 8192 And everything is OK.
Does it mean I should modify the size according the numbers of monitored items?
Thank you very much.