[admin@MikroTik] > /interface wireless export hide-sensitive
# jun/25/2019 09:19:03 by RouterOS 6.44.3
# software id = ZAWM-H166
#
# model = 951G-2HnD
# serial number = 4699027376A7
/interface wireless
set [ find default-name=wlan1 ] band=2ghz-b/g/n channel-width=20/40mhz-Ce \
    country=russia3 disabled=no distance=indoors frequency-mode=\
    regulatory-domain mode=ap-bridge ssid=V-01 wmm-support=enabled wps-mode=\
    disabled
/interface wireless security-profiles
set [ find default=yes ] authentication-types=wpa2-psk eap-methods="" mode=\
    dynamic-keys supplicant-identity=MikroTik
[admin@MikroTik] > 

ladmin@ushare:~$ sudo service tftpd-hpa status
● tftpd-hpa.service - LSB: HPA's tftp server
   Loaded: loaded (/etc/init.d/tftpd-hpa; generated)
   Active: active (running) since Mon 2019-06-24 08:14:34 UTC; 17h ago
     Docs: man:systemd-sysv-generator(8)
    Tasks: 1 (limit: 2318)
   CGroup: /system.slice/tftpd-hpa.service
           └─12799 /usr/sbin/in.tftpd --listen --user tftp --address :69 --secure --create --verbose /media/pxeboot

Jun 24 08:14:33 ushare systemd[1]: Starting LSB: HPA's tftp server...
Jun 24 08:14:34 ushare tftpd-hpa[12782]:  * Starting HPA's tftpd in.tftpd
Jun 24 08:14:34 ushare tftpd-hpa[12782]:    ...done.
Jun 24 08:14:34 ushare systemd[1]: Started LSB: HPA's tftp server.
Jun 25 01:42:57 ushare in.tftpd[13571]: RRQ from 192.168.0.32 filename BOOTMGR
Jun 25 01:42:57 ushare in.tftpd[13571]: tftp: client does not accept options
Jun 25 01:42:57 ushare in.tftpd[13574]: RRQ from 192.168.0.32 filename BOOTMGR
ladmin@ushare:~$

D:\>tftp.exe -i 192.168.0.70 get BOOTMGR D:\Loaded
WinAgents TFTP Client version 2.0b Copyright (c) 2004-2011 by Tandem Systems, Ltd.
http://www.winagents.com - Software for network administrators
 
Transfering file BOOTMGR from server in octet mode...
Transferring data from 192.168.0.70...
Error occurred during the file transfer (Error code = 0):
Timeout expired. Retries expired.
D:\>

# /etc/default/tftpd-hpa
 
TFTP_USERNAME="tftp"
TFTP_DIRECTORY="/media/pxeboot"
TFTP_ADDRESS=":69"
TFTP_OPTIONS="--secure --create --verbose"

ladmin@ushare:/etc$ sudo service ufw status verbose
● ufw.service - Uncomplicated firewall
   Loaded: loaded (/lib/systemd/system/ufw.service; enabled; vendor preset: enabled)
   Active: active (exited) since Mon 2019-06-24 05:35:43 UTC; 24h ago
     Docs: man:ufw(8)
 Main PID: 372 (code=exited, status=0/SUCCESS)
    Tasks: 0 (limit: 2318)
   CGroup: /system.slice/ufw.service

ladmin@ushare:/etc$ sudo ufw allow 69/udp
Rules updated
Rules updated (v6)
ladmin@ushare:/etc$

D:\>tftp.exe -i 192.168.0.70 get bootmgr D:\Loaded
 
WinAgents TFTP Client version 2.0b Copyright (c) 2004-2011 by Tandem Systems, Ltd.
http://www.winagents.com - Software for network administrators
 
Transfering file bootmgr from server in octet mode...
Transferring data from 192.168.0.70...
Error occurred during the file transfer (Error code = 0):
Timeout expired. Retries expired.
D:\>