else if(!strcmp(command, "cp")) {
            //send file size
            printf("COPIEZ %s\n", parameter);
            FILE * f = fopen(parameter, "rb");
            fseek(f, 0, SEEK_END);
            unsigned long len = (unsigned long)ftell(f);
            sprintf(buffer, "%lu", len);
            send_msg_with(buffer);
            rewind(f);
            size_t m;
            char* chunk = (char*)malloc(MSGSIZE);
            i = 0;
            wait_for_ack();

            // send file chunks
            while(1)
            {
                m = fread(chunk, 1, MSGSIZE, f);
                if(!m)
                    break;

                //printf("TRIMIT MESAJUL %d CU MARIME %d\n", i++, m);

                msg date;
                sprintf(date.payload, "%s", chunk);
                date.len = m;
                send_message(&date);

                wait_for_ack();
            }