@judetf Can you explain exactly how you connected the satelite in the 4 way switch? There are 4 travelers in the 4 way switch (2 red 2 black). Satelites are also supposed to have the load wire connected and there is no load wire in a 4 way switch.

  @Chicago_SH thanks I got this to work as well. I used  hs210 kit. i put the smart switch at each end. in the middle i put a standard fourway switch.p

  @Chicago_SH 

i have this configuration and the 4 way dumb switch cant turn the light ON from an off position, can only turn the light off if its on?

 I've been DIY ing  for a long time with TP link products.  I just built a house and there are multiple locations with 4, and even 5 and 6 way.   I have drawn out the circuits checked things with volt meter and ohm meters to make sure everything is correct. However both sets I've installed so far failed. The 4 way switch does nothing.   If lights are on, flipping the 4 way flickers but stays on.  If lights are off nothing happens.  Pretty frustrating.  Customer service won't help because they don't support 4 or more way installation.  I'm using KS-230 kits.  All of my 3 way set ups and single poles work fine.  I need some (but not all) of the middle switches to work.  Any ideas anyone??   It seems like it would be easy to make and sell a pass thru switch that would transmit via wifi on and off????!!!!   

  @board4mic 

Is there any way to get dimming to work in this scenario, even if the app cant control it? 

  @JM1010101 in my experience if the line and load switches (first and last) are installed correctly it can work.  However, I did get a "switch is incorrectly wired" note and had to turn breaker off then back on and it worked.  The lights sometimes are delayed in responding but the two pairs that I've installed work with the app just fine.  

  @Beaugas were you able to get this situation remedied? I have the exact same issue. 

If I'm willing to eliminate one of the switches in my 4-way (and just put a blank panel there), will the kasa 3-way dimmer kit work?