I know this topic is old, but I was experiencing the same problem and figured I would respond to it with the fix to the issue. Just in case someone else comes to the forum with the same issue.
To get the start/include button to work after you upload the files to vera (from the Mysensors Github Repo)
using putty or terminal SSH into your pi and type
sudo nano /home/pi/MySensors/examples_linux/mysgw.cpp
when nano opens hit ctrl-w to search for "MY_INCLUSION" and then remove the // marks before #define to enable inclusion mode on your pi gateway.
#define MY_INCLUSION_MODE_FEATURE
after that reboot and it should start to work. If you need to see what your gateway is doing I suggest enabling debug (Explained from the Pi Gateway installation from this site ... copied and pasted below for quick reference)
When installed as a service, the output of the gateway will be directed to syslog in /var/log/syslog.
If you want full debug output from the gateway to be logged to syslog (including serial protocol) you have to edit the following file: /etc/systemd/system/mysgw.service
Add the -d parameter to the ExecStart line
[Service]
ExecStart=/usr/local/bin/mysgw -d
hit control+x to exit and it will ask you if you want to save hit y and then enter.
Then reload the systemd process and restart the gateway
sudo systemctl daemon-reload
sudo systemctl restart mysgw.service
Now the output from the gateway can be monitored by
tail -f /var/log/syslog
Everything your Pi gateway is doing will be logged in real time in your putty or terminal window from the syslog file. Remove the -d from the /etc/systemd/system/mysgw.service file to remove all the debug info.
When you enable debug you should be able to see that the gateway is listening for the children nodes. you may have to plug your children into your computer via usb and open arduino IDE and hit command+shift+M to open the serial monitor to see if your child node is working and broadcasting a signal properly.
