Segment Fault on modbus_receive

[rucnev...@gmail.com]

Hello,

I'm creating a modus TCP server on a linux OS by following code,

   modbus_t *ctx = modbus_new_tcp('127.0.0.1', 1502);

   uint8_t *query = new uint8_t[MODBUS_TCP_MAX_ADU_LENGTH];
    log(QString("create modbus mapping"));
    modbus_mapping_t *mb_mapping = modbus_mapping_new(0,0,32000,0);
    if (mb_mapping == NULL){
        log(QString("failed to create modbus mapping"));
        modbus->close();
        return;
    }
    log(QString("start to listen..."));
    int s = modbus_tcp_listen(ctx, 1);
    log(QString("accept connection..."));
    modbus_tcp_accept(ctx, &s);
    int rc = 0;
    log(QString("request receiving..."));
    rc = modbus_receive(ctx, query); --> Seg Fault here!
    log(QString("modbus tcp request received."));
    this->arm(mb_mapping);
    rc = modbus_reply(ctx, query, rc, mb_mapping);
    log(QString("modbus tcp response send."));

This is just a simple test, what I want is just to open the port and handle a single connection. 

In my test, I can create the connection, but I always got Segment Fault when I send request like '00 00 00 00 00 06 01 03 00 00 00 01'. 

And here are the logs, apperently, the modbus_reply methods trigger the Segment Fault.

2018-03-27 00:43:31 create modbus mapping 2018-03-27 00:43:31 start to listen... 2018-03-27 00:43:31 accept connection... 2018-03-27 00:43:45 request receiving...

I'm using libmodbus 3.1.4

Do you have some clue or suggest on this issue? Thanks!

BR,

Jipeng