XELK-AN-005: Qt5 application remoted using VNC server
From DAVE Developer's Wiki
Info Box
|
Contents
History
| Version | Date | Notes |
|---|---|---|
| 1.0.0 | Apr 2018 | First release |
Introduction
This application note describes how to display remotely the local Qt5 application using standard connectivity application like VNC.
The SBCX platform and the AxelLite module is used as Embedded Platform running a Qt 5.6.2 example and displaying it remotely on a PC and a TV.
VNC
Starting from original Yocto based root file system provided here, more packages need to be added for using the well known VNC remote desktop (screen sharing) application.
We assume that network interface has been already configured for Internet access. In any case, simple configuration can be done directly on serial console with the following commands:
root@axellite:~# ifconfig eth0 192.168.0.94 root@axellite:~# route add default gw 192.168.0.254 root@axellite:~# echo "nameserver 8.8.8.8" > /etc/resolv.conf
where 192.168.0.254 is the gateway address and 8.8.8.8 is the DNS server (in this case Google's one).
It is possibile to install the VNC server using the smart package manager on DAVE's XELK kit Yocto distribution:
Firts of all, SMART channels must be added for accessing DAVE's server for Yocto pre-built packages, and the smart database has to be updated using the following commands:
root@sbc-lynx:~# smart channel --add cortexa9hf_neon type=rpm-md baseurl=http://yocto.dave.eu/xelk-latest/cortexa9hf_neon Alias: cortexa9hf_neon Type: rpm-md Base URL: http://yocto.dave.eu/xelk-latest/cortexa9hf_neon Include this channel? (y/N): y root@axellite:~# smart update Updating cache... ################################################################## [100%] Fetching information for 'cortexa9hf_neon'... -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/repodata/repomd.xml repomd.xml ################################################################## [ 50%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/repodata/filelists.xml.gz -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/repodata/primary.xml.gz filelists.xml.gz ################################################################## [ 75%] primary.xml.gz ################################################################## [100%] Updating cache... ################################################################## [100%] Channels have 17503 new packages. Saving cache... root@axellite:~#
Then, once the smart database has been updated, it is possible to use the install option for smart:
root@axellite:~# smart install x11vnc Loading cache... Updating cache... ################################################################## [100%] Computing transaction... Installing packages (23): libatk-1.0-0-2.18.0-r0@cortexa9hf_neon libxcomposite1-1:0.4.4-r0@cortexa9hf_neon libgdk-pixbuf-2.0-loader-gif-2.32.3-r0@cortexa9hf_neon libxcursor1-1:1.1.14-r0@cortexa9hf_neon libgdk-pixbuf-2.0-loader-jpeg-2.32.3-r0@cortexa9hf_neon libxdamage1-1:1.1.4-r0@cortexa9hf_neon libgdk-pixbuf-2.0-loader-png-2.32.3-r0@cortexa9hf_neon libxdmcp6-1:1.1.2-r0@cortexa9hf_neon libgdk-pixbuf-2.0-loader-xpm-2.32.3-r0@cortexa9hf_neon libxext6-1:1.3.3-r0@cortexa9hf_neon libgtk-2.0-2.24.29-r0@cortexa9hf_neon libxfixes3-1:5.0.1-r0@cortexa9hf_neon libvncserver-0.9.10-r0@cortexa9hf_neon libxi6-1:1.7.6-r0@cortexa9hf_neon libx11-6-1:1.6.3-r0@cortexa9hf_neon libxrandr2-1:1.5.0-r0@cortexa9hf_neon libxau6-1:1.0.8-r0@cortexa9hf_neon libxrender1-1:0.9.9-r0@cortexa9hf_neon libxcb-render0-1.11.1-r0@cortexa9hf_neon libxtst6-1:1.2.2-r0@cortexa9hf_neon libxcb-shm0-1.11.1-r0@cortexa9hf_neon x11vnc-0.9.13-r0@cortexa9hf_neon libxcb1-1.11.1-r0@cortexa9hf_neon 4.5MB of package files are needed. 9.5MB will be used. Confirm changes? (Y/n): Y Fetching packages... -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxext6-1.3.3-r0.cortexa9hf_neon.rpm -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libgdk-pixbuf-2.0-loader-png-2.32.3-r0.cortexa9hf_neon.rpm libgdk-pixbuf-2.0-loader-png-2.32.3-r0.cortex.. ################################################################## [ 4%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxtst6-1.2.2-r0.cortexa9hf_neon.rpm libxtst6-1.2.2-r0.cortexa9hf_neon.rpm ################################################################## [ 8%] libxext6-1.3.3-r0.cortexa9hf_neon.rpm ################################################################## [ 13%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxcb-render0-1.11.1-r0.cortexa9hf_neon.rpm -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxrandr2-1.5.0-r0.cortexa9hf_neon.rpm libxrandr2-1.5.0-r0.cortexa9hf_neon.rpm ################################################################## [ 17%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libvncserver-0.9.10-r0.cortexa9hf_neon.rpm libvncserver-0.9.10-r0.cortexa9hf_neon.rpm ################################################################## [ 21%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxau6-1.0.8-r0.cortexa9hf_neon.rpm libxau6-1.0.8-r0.cortexa9hf_neon.rpm ################################################################## [ 26%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxi6-1.7.6-r0.cortexa9hf_neon.rpm libxi6-1.7.6-r0.cortexa9hf_neon.rpm ################################################################## [ 30%] libxcb-render0-1.11.1-r0.cortexa9hf_neon.rpm ################################################################## [ 34%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxcursor1-1.1.14-r0.cortexa9hf_neon.rpm -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxcb1-1.11.1-r0.cortexa9hf_neon.rpm libxcb1-1.11.1-r0.cortexa9hf_neon.rpm ################################################################## [ 39%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libatk-1.0-0-2.18.0-r0.cortexa9hf_neon.rpm libatk-1.0-0-2.18.0-r0.cortexa9hf_neon.rpm ################################################################## [ 43%] libxcursor1-1.1.14-r0.cortexa9hf_neon.rpm ################################################################## [ 47%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/x11vnc-0.9.13-r0.cortexa9hf_neon.rpm -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libgdk-pixbuf-2.0-loader-jpeg-2.32.3-r0.cortexa9hf_neon.rpm libgdk-pixbuf-2.0-loader-jpeg-2.32.3-r0.corte.. ################################################################## [ 52%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxcb-shm0-1.11.1-r0.cortexa9hf_neon.rpm libxcb-shm0-1.11.1-r0.cortexa9hf_neon.rpm ################################################################## [ 56%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxdamage1-1.1.4-r0.cortexa9hf_neon.rpm libxdamage1-1.1.4-r0.cortexa9hf_neon.rpm ################################################################## [ 60%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxrender1-0.9.9-r0.cortexa9hf_neon.rpm libxrender1-0.9.9-r0.cortexa9hf_neon.rpm ################################################################## [ 65%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libgdk-pixbuf-2.0-loader-gif-2.32.3-r0.cortexa9hf_neon.rpm libgdk-pixbuf-2.0-loader-gif-2.32.3-r0.cortex.. ################################################################## [ 69%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libx11-6-1.6.3-r0.cortexa9hf_neon.rpm libx11-6-1.6.3-r0.cortexa9hf_neon.rpm ################################################################## [ 73%] x11vnc-0.9.13-r0.cortexa9hf_neon.rpm ################################################################## [ 78%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxdmcp6-1.1.2-r0.cortexa9hf_neon.rpm libxdmcp6-1.1.2-r0.cortexa9hf_neon.rpm ################################################################## [ 82%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libgdk-pixbuf-2.0-loader-xpm-2.32.3-r0.cortexa9hf_neon.rpm -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxcomposite1-0.4.4-r0.cortexa9hf_neon.rpm libxcomposite1-0.4.4-r0.cortexa9hf_neon.rpm ################################################################## [ 86%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libxfixes3-5.0.1-r0.cortexa9hf_neon.rpm libxfixes3-5.0.1-r0.cortexa9hf_neon.rpm ################################################################## [ 91%] libgdk-pixbuf-2.0-loader-xpm-2.32.3-r0.cortex.. ################################################################## [ 95%] -> http://yocto.dave.eu/xelk-latest/cortexa9hf_neon/libgtk-2.0-2.24.29-r0.cortexa9hf_neon.rpm libgtk-2.0-2.24.29-r0.cortexa9hf_neon.rpm ################################################################## [100%] Committing transaction... Preparing... ################################################################## [ 0%] 1:Installing libxau6 ################################################################## [ 4%] 2:Installing libgdk-pixbuf-2.0-loader-gif ################################################################## [ 8%] 3:Installing libgdk-pixbuf-2.0-loader-jpeg ################################################################## [ 13%] 4:Installing libgdk-pixbuf-2.0-loader-xpm ################################################################## [ 17%] 5:Installing libgdk-pixbuf-2.0-loader-png ################################################################## [ 21%] 6:Installing libxdmcp6 ################################################################## [ 26%] 7:Installing libatk-1.0-0 ################################################################## [ 30%] 8:Installing libxcb1 ################################################################## [ 34%] 9:Installing libxcb-shm0 ################################################################## [ 39%] 10:Installing libxcb-render0 ################################################################## [ 43%] 11:Installing libx11-6 ################################################################## [ 47%] 12:Installing libxfixes3 ################################################################## [ 52%] 13:Installing libxcomposite1 ################################################################## [ 56%] 14:Installing libxext6 ################################################################## [ 60%] 15:Installing libxrender1 ################################################################## [ 65%] 16:Installing libxdamage1 ################################################################## [ 69%] 17:Installing libxi6 ################################################################## [ 73%] 18:Installing libxcursor1 ################################################################## [ 78%] 19:Installing libxrandr2 ################################################################## [ 82%] 20:Installing libxtst6 ################################################################## [ 86%] 21:Installing libgtk-2.0 ################################################################## [ 91%] Output from libgtk-2.0-2.24.29-r0@cortexa9hf_neon: update-alternatives: Linking /usr/bin/gtk-update-icon-cache to /usr/bin/gtk-update-icon-cache-2.0 22:Installing libvncserver ################################################################## [ 95%] 23:Installing x11vnc ################################################################## [100%] root@axellite:~#
server command line
The command line used is the following one:
x11vnc -noipv6 -rawfb /dev/fb0 -clip WxH
where the W and H parameters are the width and height size of the screen to be remoted.
Test bed
- lcd panel is 800x480
root@axellite:~# x11vnc -noipv6 -rawfb /dev/fb0 -passwd qt5remote 14/02/2018 09:50:43 passing arg to libvncserver: -passwd 14/02/2018 09:50:43 x11vnc version: 0.9.13 lastmod: 2011-08-10 pid: 367 14/02/2018 09:50:43 Not opening DISPLAY in -rawfb mode (force via -rawfb +str) 14/02/2018 09:50:43 Continuing without X display in -rawfb mode. 14/02/2018 09:50:43 console_guess: file is /dev/fb0 14/02/2018 09:50:43 console_guess: file pipeinput CONSOLE0 14/02/2018 09:50:43 pipeinput: using linux console: /dev/tty0 14/02/2018 09:50:43 console_guess returned: map:/dev/fb0@800x480x16:f800/7e0/1f 14/02/2018 09:50:43 raw fb is non-regular file: /dev/fb0 14/02/2018 09:50:43 rawfb: mmap file: /dev/fb0 14/02/2018 09:50:43 w: 800 h: 480 b: 16 addr: 0x763df000 sz: 768000 14/02/2018 09:50:43 pipeinput: using linux console: /dev/tty0 14/02/2018 09:50:43 initialize_screen: fb_depth/fb_bpp/fb_Bpl 16/16/1600 14/02/2018 09:50:43 14/02/2018 09:50:43 Raw fb at addr 0x763df000 is 16bpp depth=16 true color 14/02/2018 09:50:43 14/02/2018 09:50:43 Autoprobing TCP port 14/02/2018 09:50:43 Autoprobing selected TCP port 5900 14/02/2018 09:50:43 Autoprobing TCP6 port 14/02/2018 09:50:43 Autoprobing selected TCP6 port 5900 14/02/2018 09:50:43 Not listening on IPv6 interface. 14/02/2018 09:50:44 fb read rate: 79 MB/sec 14/02/2018 09:50:44 screen setup finished. 14/02/2018 09:50:44 The VNC desktop is: axellite:0 PORT=5900
Connection
On a Windows PC, it is possible to start the VNC viewer, like UltraVNC Viewer, and selecting the SBCX board's IP address:
On the target, the VNC server shows the remote connection is accepted:
14/02/2018 09:51:29 Got connection from client 192.168.0.21 14/02/2018 09:51:29 other clients: 14/02/2018 09:51:29 Normal socket connection 14/02/2018 09:51:29 incr accepted_client=1 for 192.168.0.21:62093 sock=9 14/02/2018 09:51:29 Client Protocol Version 3.8 14/02/2018 09:51:29 Protocol version sent 3.8, using 3.8 14/02/2018 09:51:29 rfbProcessClientSecurityType: executing handler for type 2 14/02/2018 09:51:33 client useCopyRect: 192.168.0.21 0 14/02/2018 09:51:33 client_set_net: 192.168.0.21 0.0310 14/02/2018 09:51:33 Pixel format for client 192.168.0.21: 14/02/2018 09:51:33 16 bpp, depth 16, little endian 14/02/2018 09:51:33 true colour: max r 31 g 63 b 31, shift r 11 g 5 b 0 14/02/2018 09:51:33 no translation needed 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x0000000A) 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type zlibhex 14/02/2018 09:51:33 Using compression level 6 for client 192.168.0.21 14/02/2018 09:51:33 Enabling full-color cursor updates for client 192.168.0.21 14/02/2018 09:51:33 Enabling cursor position updates for client 192.168.0.21 14/02/2018 09:51:33 Using image quality level 6 for client 192.168.0.21 14/02/2018 09:51:33 Using JPEG subsampling 0, Q79 for client 192.168.0.21 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type xorEnable 14/02/2018 09:51:33 Enabling LastRect protocol extension for client 192.168.0.21 14/02/2018 09:51:33 Enabling NewFBSize protocol extension for client 192.168.0.21 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type cacheEnable 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8000) 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8001) 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8002) 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8003) 14/02/2018 09:51:33 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xC0A1E5CE) 14/02/2018 09:51:33 Using ZRLE encoding for client 192.168.0.21 14/02/2018 09:51:34 Pixel format for client 192.168.0.21: 14/02/2018 09:51:34 16 bpp, depth 16, little endian 14/02/2018 09:51:34 true colour: max r 31 g 63 b 31, shift r 11 g 5 b 0 14/02/2018 09:51:34 no translation needed 14/02/2018 09:51:34 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0x0000000A) 14/02/2018 09:51:34 rfbProcessClientNormalMessage: ignoring unsupported encoding type zlibhex 14/02/2018 09:51:34 Using compression level 6 for client 192.168.0.21 14/02/2018 09:51:34 Enabling full-color cursor updates for client 192.168.0.21 14/02/2018 09:51:34 Enabling cursor position updates for client 192.168.0.21 14/02/2018 09:51:34 Using image quality level 6 for client 192.168.0.21 14/02/2018 09:51:34 Using JPEG subsampling 0, Q79 for client 192.168.0.21 14/02/2018 09:51:34 rfbProcessClientNormalMessage: ignoring unsupported encoding type xorEnable 14/02/2018 09:51:34 Enabling LastRect protocol extension for client 192.168.0.21 14/02/2018 09:51:34 Enabling NewFBSize protocol extension for client 192.168.0.21 14/02/2018 09:51:34 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8000) 14/02/2018 09:51:34 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8001) 14/02/2018 09:51:34 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8002) 14/02/2018 09:51:34 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xFFFF8003) 14/02/2018 09:51:34 rfbProcessClientNormalMessage: ignoring unsupported encoding type Enc(0xC0A1E5CE) 14/02/2018 09:51:34 Switching from ZRLE to hextile Encoding for client 192.168.0.21 14/02/2018 09:51:34 client 1 network rate 196.5 KB/sec (6073.7 eff KB/sec) 14/02/2018 09:51:34 client 1 latency: 1.5 ms 14/02/2018 09:51:34 dt1: 0.0669, dt2: 0.0605 dt3: 0.0015 bytes: 24866 14/02/2018 09:51:34 link_rate: LR_UNKNOWN - 1 ms, 196 KB/s
