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char *createMsg( char *hdr, TLV tlv)
{       char *p_msg;
// do we need to pad message with zeros ??
uint32_t msg_length;
msg_length = strlen(hdr)+tlv.param_length;
if( msg_length%4 == 0)
{
    if((p_msg=(char *)malloc(msg_length))==NULL)
    {
        printf("Memory allocation has failed");
    }
    memmove(p_msg,hdr,8);
    msg_length = htonl(msg_length); // 32bit number network byte order needed;
    memmove(p_msg+4,&msg_length,4);
    memmove(p_msg+8,&tlv.param_tag,2);
    memmove(p_msg+10,&tlv.param_length,2);
    memmove(p_msg+12,tlv.value,tlv.param_length-2); // without param_length field;
}
    else
    {
        int padding;
        padding = msg_length%4;
        if((p_msg=(char *)malloc(msg_length+padding))==NULL)
        {
            printf("Memory allocation has failed");
        }
    memmove(p_msg,hdr,8);
    msg_length = htonl(msg_length); // 32bit number network byte order needed;
    memmove(p_msg+4,&msg_length,4);
    memmove(p_msg+8,&tlv.param_tag,2);
    memmove(p_msg+10,&tlv.param_length,2);
    int i;
    char pad[padding];
    for(i =0;i<=padding;i++)
    {
        pad[i]='0';
    }
    memmove(p_msg+msg_length+1,&pad,1);
    }
return p_msg;
}