How many bulbs ect can you connect to one app? I have connected a few but now I would like to add a spot and it flashes but not connecting.
I’m not sure. But there are probably people here who want to tell you, but then you have to tell which app and which protocol you use. Zigbee or z-wave or something else.
You can add as many devices to a app as you want. This isnt a limitation of the app but a limitation of homey. Zwave is i believe 250 +/- devices. Zigbee more i belive
But as you not given any other information, it would be a big gamble for us to help you.