Your device must have SNMP support enabled with correct credentials. And IP of your netxms server must have permission to query your device.
MIB files are used only to add textual representation of OID and human readable description to OID.
Please try to walk across SNMP tree of your device in a CLI with util from net-snmp
snmpwalk -v2c -c COMMUNITY 192.168.27.78 .1.3.6.1.2.1.1.1
SNMPv2-MIB::sysDescr.0 = STRING: Device: QSW-4610-28T-AC
SoftWare Version 8.2.1.177
BootRom Version 2011.12.21
HardWare Version 1.0.2
Serial No.:6210021120210459
Copyright (C) 2021 by QTECH LLC
All rights reserved
or with netxms server's CLI util
nxsnmpwalk -v2c -c COMMUNITY 192.168.27.78 .1.3.6.1.2.1.1.1
.1.3.6.1.2.1.1.1.0 [STRING]: Device: QSW-4610-28T-AC
SoftWare Version 8.2.1.177
BootRom Version 2011.12.21
HardWare Version 1.0.2
Serial No.:6210021120210459
Copyright (C) 2021 by QTECH LLC
All rights reserved
You should get similar response indicating correct settings of your device
