diff --git a/README.md b/README.md
index e8de565..9024b7c 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,14 @@
 # Wifi-Relay
 
-Switch a relay with mqtt via wifi.
\ No newline at end of file
+This schematic and code can be used to build up a relay, which can be switched over wifi by sending on/off commands to a MQTT channel.
+
+## Cicurit / Board
+
+The cicurit is build upon a ESP-01 (ESP8266) module which GPIO2 pin switches the relay. To program the ESP-01 one may solder a pin socket on the board and put the ESP-01 in, instead of soldering it directly onto the board ;-)
+
+## Source
+
+The code is quite simple. It connects to a MQTT broker and subscribes to a channel /<Hostname>/relay to recieve the on/off command. The current state of the relay is then published to the channel /<Hostname>/relay/state.
+
+Enjoy.
+
diff --git a/cicurit/wifi_relais.kicad_pcb b/cicurit/wifi_relais.kicad_pcb
new file mode 100644
index 0000000..4902ef4
--- /dev/null
+++ b/cicurit/wifi_relais.kicad_pcb
@@ -0,0 +1,652 @@
+(kicad_pcb (version 20171130) (host pcbnew 5.1.8+dfsg1-1)
+
+  (general
+    (thickness 1.6)
+    (drawings 10)
+    (tracks 68)
+    (zones 0)
+    (modules 9)
+    (nets 16)
+  )
+
+  (page A4)
+  (layers
+    (0 F.Cu signal)
+    (31 B.Cu signal)
+    (33 F.Adhes user hide)
+    (35 F.Paste user hide)
+    (37 F.SilkS user)
+    (38 B.Mask user hide)
+    (39 F.Mask user hide)
+    (40 Dwgs.User user hide)
+    (41 Cmts.User user hide)
+    (42 Eco1.User user hide)
+    (43 Eco2.User user hide)
+    (44 Edge.Cuts user)
+    (45 Margin user hide)
+    (46 B.CrtYd user hide)
+    (47 F.CrtYd user hide)
+    (49 F.Fab user hide)
+  )
+
+  (setup
+    (last_trace_width 0.6)
+    (trace_clearance 0.2)
+    (zone_clearance 0.508)
+    (zone_45_only no)
+    (trace_min 0.2)
+    (via_size 0.8)
+    (via_drill 0.4)
+    (via_min_size 0.4)
+    (via_min_drill 0.3)
+    (uvia_size 0.3)
+    (uvia_drill 0.1)
+    (uvias_allowed no)
+    (uvia_min_size 0.2)
+    (uvia_min_drill 0.1)
+    (edge_width 0.05)
+    (segment_width 0.2)
+    (pcb_text_width 0.3)
+    (pcb_text_size 1.5 1.5)
+    (mod_edge_width 0.12)
+    (mod_text_size 1 1)
+    (mod_text_width 0.15)
+    (pad_size 1.524 1.524)
+    (pad_drill 0.762)
+    (pad_to_mask_clearance 0)
+    (aux_axis_origin 0 0)
+    (visible_elements FEFFFFFF)
+    (pcbplotparams
+      (layerselection 0x010fc_ffffffff)
+      (usegerberextensions false)
+      (usegerberattributes true)
+      (usegerberadvancedattributes true)
+      (creategerberjobfile true)
+      (excludeedgelayer true)
+      (linewidth 0.100000)
+      (plotframeref false)
+      (viasonmask false)
+      (mode 1)
+      (useauxorigin false)
+      (hpglpennumber 1)
+      (hpglpenspeed 20)
+      (hpglpendiameter 15.000000)
+      (psnegative false)
+      (psa4output false)
+      (plotreference true)
+      (plotvalue true)
+      (plotinvisibletext false)
+      (padsonsilk false)
+      (subtractmaskfromsilk false)
+      (outputformat 1)
+      (mirror false)
+      (drillshape 1)
+      (scaleselection 1)
+      (outputdirectory ""))
+  )
+
+  (net 0 "")
+  (net 1 "Net-(D1-Pad2)")
+  (net 2 "Net-(J1-Pad5)")
+  (net 3 "Net-(J1-Pad4)")
+  (net 4 "Net-(J1-Pad3)")
+  (net 5 /3,3V)
+  (net 6 "Net-(Q1-Pad1)")
+  (net 7 "Net-(Q1-Pad2)")
+  (net 8 "Net-(Q2-Pad2)")
+  (net 9 "Net-(R1-Pad1)")
+  (net 10 "Net-(U1-Pad7)")
+  (net 11 "Net-(U1-Pad5)")
+  (net 12 "Net-(U1-Pad4)")
+  (net 13 "Net-(U1-Pad3)")
+  (net 14 /5V)
+  (net 15 /GND)
+
+  (net_class Default "This is the default net class."
+    (clearance 0.2)
+    (trace_width 0.6)
+    (via_dia 0.8)
+    (via_drill 0.4)
+    (uvia_dia 0.3)
+    (uvia_drill 0.1)
+    (add_net /3,3V)
+    (add_net /5V)
+    (add_net /GND)
+    (add_net "Net-(D1-Pad2)")
+    (add_net "Net-(Q1-Pad1)")
+    (add_net "Net-(Q1-Pad2)")
+    (add_net "Net-(Q2-Pad2)")
+    (add_net "Net-(R1-Pad1)")
+    (add_net "Net-(U1-Pad3)")
+    (add_net "Net-(U1-Pad4)")
+    (add_net "Net-(U1-Pad5)")
+    (add_net "Net-(U1-Pad7)")
+  )
+
+  (net_class Breit ""
+    (clearance 0.2)
+    (trace_width 1.8)
+    (via_dia 0.8)
+    (via_drill 0.4)
+    (uvia_dia 0.3)
+    (uvia_drill 0.1)
+    (add_net "Net-(J1-Pad3)")
+    (add_net "Net-(J1-Pad4)")
+    (add_net "Net-(J1-Pad5)")
+  )
+
+  (module RF_Module:ESP-01 (layer F.Cu) (tedit 5F88BF57) (tstamp 5FCBF804)
+    (at 121.256 59.449)
+    (descr "Wi-Fi Module")
+    (tags "Wi-Fi Module")
+    (path /5FCB393A)
+    (fp_text reference U1 (at -0.057 8.938) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value ESP-01 (at -0.07 -1.37) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start -7.69 -13.57) (end 7.55 -13.57) (layer Dwgs.User) (width 0.12))
+    (fp_line (start 7.55 -13.57) (end 7.55 11.83) (layer Dwgs.User) (width 0.12))
+    (fp_line (start 7.55 11.83) (end -7.69 11.83) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -7.69 11.83) (end -7.69 -13.57) (layer Dwgs.User) (width 0.12))
+    (fp_line (start 6.28 -12.3) (end 2.47 -12.3) (layer Dwgs.User) (width 0.12))
+    (fp_line (start 2.47 -12.3) (end 2.47 -7.22) (layer Dwgs.User) (width 0.12))
+    (fp_line (start 2.47 -7.22) (end 1.2 -7.22) (layer Dwgs.User) (width 0.12))
+    (fp_line (start 1.2 -7.22) (end 1.2 -12.3) (layer Dwgs.User) (width 0.12))
+    (fp_line (start 1.2 -12.3) (end -0.07 -12.3) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -0.07 -12.3) (end -0.07 -7.22) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -0.07 -7.22) (end -1.34 -7.22) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -1.34 -7.22) (end -1.34 -12.3) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -1.34 -12.3) (end -2.61 -12.3) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -2.61 -12.3) (end -2.61 -7.22) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -2.61 -7.22) (end -3.88 -7.22) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -3.88 -7.22) (end -3.88 -12.3) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -3.88 -12.3) (end -5.15 -12.3) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -5.15 -12.3) (end -5.15 -5.315) (layer Dwgs.User) (width 0.12))
+    (fp_line (start -5.15 -5.315) (end 2.47 -5.315) (layer Dwgs.User) (width 0.12))
+    (pad 8 thru_hole circle (at 3.81 10.16) (size 1.524 1.524) (drill 0.762) (layers B.Cu B.Mask)
+      (net 5 /3,3V))
+    (pad 7 thru_hole circle (at 1.27 10.16) (size 1.524 1.524) (drill 0.762) (layers B.Cu B.Mask)
+      (net 10 "Net-(U1-Pad7)"))
+    (pad 6 thru_hole circle (at -1.27 10.16) (size 1.524 1.524) (drill 0.762) (layers B.Cu B.Mask)
+      (net 5 /3,3V))
+    (pad 5 thru_hole circle (at -3.81 10.16) (size 1.524 1.524) (drill 0.762) (layers B.Cu B.Mask)
+      (net 11 "Net-(U1-Pad5)"))
+    (pad 4 thru_hole rect (at 3.81 7.62) (size 1.524 1.524) (drill 0.762) (layers B.Cu B.Mask)
+      (net 12 "Net-(U1-Pad4)"))
+    (pad 3 thru_hole circle (at 1.27 7.62) (size 1.524 1.524) (drill 0.762) (layers B.Cu B.Mask)
+      (net 13 "Net-(U1-Pad3)"))
+    (pad 2 thru_hole circle (at -1.27 7.62) (size 1.524 1.524) (drill 0.762) (layers B.Cu B.Mask)
+      (net 9 "Net-(R1-Pad1)"))
+    (pad 1 thru_hole rect (at -3.81 7.62) (size 1.524 1.524) (drill 0.762) (layers B.Cu B.Mask)
+      (net 15 /GND))
+  )
+
+  (module Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal (layer F.Cu) (tedit 5AE5139B) (tstamp 5FCB1B7B)
+    (at 125.616 50.024 180)
+    (descr "Resistor, Axial_DIN0207 series, Axial, Horizontal, pin pitch=10.16mm, 0.25W = 1/4W, length*diameter=6.3*2.5mm^2, http://cdn-reichelt.de/documents/datenblatt/B400/1_4W%23YAG.pdf")
+    (tags "Resistor Axial_DIN0207 series Axial Horizontal pin pitch 10.16mm 0.25W = 1/4W length 6.3mm diameter 2.5mm")
+    (path /5FCAC893)
+    (fp_text reference R2 (at 5.202 -0.081) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value 470 (at 5.08 2.37) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start 11.21 -1.5) (end -1.05 -1.5) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 11.21 1.5) (end 11.21 -1.5) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.05 1.5) (end 11.21 1.5) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.05 -1.5) (end -1.05 1.5) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 9.12 0) (end 8.35 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.04 0) (end 1.81 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 8.35 -1.37) (end 1.81 -1.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start 8.35 1.37) (end 8.35 -1.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.81 1.37) (end 8.35 1.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.81 -1.37) (end 1.81 1.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start 10.16 0) (end 8.23 0) (layer F.Fab) (width 0.1))
+    (fp_line (start 0 0) (end 1.93 0) (layer F.Fab) (width 0.1))
+    (fp_line (start 8.23 -1.25) (end 1.93 -1.25) (layer F.Fab) (width 0.1))
+    (fp_line (start 8.23 1.25) (end 8.23 -1.25) (layer F.Fab) (width 0.1))
+    (fp_line (start 1.93 1.25) (end 8.23 1.25) (layer F.Fab) (width 0.1))
+    (fp_line (start 1.93 -1.25) (end 1.93 1.25) (layer F.Fab) (width 0.1))
+    (fp_text user %R (at 5.08 0) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad 2 thru_hole oval (at 10.16 0 180) (size 1.6 1.6) (drill 0.8) (layers *.Cu *.Mask)
+      (net 8 "Net-(Q2-Pad2)"))
+    (pad 1 thru_hole circle (at 0 0 180) (size 1.6 1.6) (drill 0.8) (layers *.Cu *.Mask)
+      (net 6 "Net-(Q1-Pad1)"))
+    (model ${KISYS3DMOD}/Resistor_THT.3dshapes/R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal.wrl
+      (at (xyz 0 0 0))
+      (scale (xyz 1 1 1))
+      (rotate (xyz 0 0 0))
+    )
+  )
+
+  (module Resistor_THT:R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal (layer F.Cu) (tedit 5AE5139B) (tstamp 5FCBE191)
+    (at 115.404 59.46)
+    (descr "Resistor, Axial_DIN0207 series, Axial, Horizontal, pin pitch=10.16mm, 0.25W = 1/4W, length*diameter=6.3*2.5mm^2, http://cdn-reichelt.de/documents/datenblatt/B400/1_4W%23YAG.pdf")
+    (tags "Resistor Axial_DIN0207 series Axial Horizontal pin pitch 10.16mm 0.25W = 1/4W length 6.3mm diameter 2.5mm")
+    (path /5FCABFFC)
+    (fp_text reference R1 (at 5.069 -0.039) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value 470 (at 5.08 2.37) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start 11.21 -1.5) (end -1.05 -1.5) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 11.21 1.5) (end 11.21 -1.5) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.05 1.5) (end 11.21 1.5) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.05 -1.5) (end -1.05 1.5) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 9.12 0) (end 8.35 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.04 0) (end 1.81 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 8.35 -1.37) (end 1.81 -1.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start 8.35 1.37) (end 8.35 -1.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.81 1.37) (end 8.35 1.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.81 -1.37) (end 1.81 1.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start 10.16 0) (end 8.23 0) (layer F.Fab) (width 0.1))
+    (fp_line (start 0 0) (end 1.93 0) (layer F.Fab) (width 0.1))
+    (fp_line (start 8.23 -1.25) (end 1.93 -1.25) (layer F.Fab) (width 0.1))
+    (fp_line (start 8.23 1.25) (end 8.23 -1.25) (layer F.Fab) (width 0.1))
+    (fp_line (start 1.93 1.25) (end 8.23 1.25) (layer F.Fab) (width 0.1))
+    (fp_line (start 1.93 -1.25) (end 1.93 1.25) (layer F.Fab) (width 0.1))
+    (fp_text user %R (at 5.08 0) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad 2 thru_hole oval (at 10.16 0) (size 1.6 1.6) (drill 0.8) (layers *.Cu *.Mask)
+      (net 7 "Net-(Q1-Pad2)"))
+    (pad 1 thru_hole circle (at 0 0) (size 1.6 1.6) (drill 0.8) (layers *.Cu *.Mask)
+      (net 9 "Net-(R1-Pad1)"))
+    (model ${KISYS3DMOD}/Resistor_THT.3dshapes/R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal.wrl
+      (at (xyz 0 0 0))
+      (scale (xyz 1 1 1))
+      (rotate (xyz 0 0 0))
+    )
+  )
+
+  (module Package_TO_SOT_THT:TO-92_Inline (layer F.Cu) (tedit 5A1DD157) (tstamp 5FCB23FA)
+    (at 117.105 54.318)
+    (descr "TO-92 leads in-line, narrow, oval pads, drill 0.75mm (see NXP sot054_po.pdf)")
+    (tags "to-92 sc-43 sc-43a sot54 PA33 transistor")
+    (path /5FCA14AE)
+    (fp_text reference Q2 (at 1.377 2.601) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value BC546 (at 1.27 2.79) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start 4 2.01) (end -1.46 2.01) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 4 2.01) (end 4 -2.73) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.46 -2.73) (end -1.46 2.01) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.46 -2.73) (end 4 -2.73) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -0.5 1.75) (end 3 1.75) (layer F.Fab) (width 0.1))
+    (fp_line (start -0.53 1.85) (end 3.07 1.85) (layer F.SilkS) (width 0.12))
+    (fp_arc (start 1.27 0) (end 1.27 -2.6) (angle 135) (layer F.SilkS) (width 0.12))
+    (fp_arc (start 1.27 0) (end 1.27 -2.48) (angle -135) (layer F.Fab) (width 0.1))
+    (fp_arc (start 1.27 0) (end 1.27 -2.6) (angle -135) (layer F.SilkS) (width 0.12))
+    (fp_arc (start 1.27 0) (end 1.27 -2.48) (angle 135) (layer F.Fab) (width 0.1))
+    (fp_text user %R (at 1.27 0) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad 1 thru_hole rect (at 0 0) (size 1.05 1.5) (drill 0.75) (layers *.Cu *.Mask)
+      (net 1 "Net-(D1-Pad2)"))
+    (pad 3 thru_hole oval (at 2.54 0) (size 1.05 1.5) (drill 0.75) (layers *.Cu *.Mask)
+      (net 15 /GND))
+    (pad 2 thru_hole oval (at 1.27 0) (size 1.05 1.5) (drill 0.75) (layers *.Cu *.Mask)
+      (net 8 "Net-(Q2-Pad2)"))
+    (model ${KISYS3DMOD}/Package_TO_SOT_THT.3dshapes/TO-92_Inline.wrl
+      (at (xyz 0 0 0))
+      (scale (xyz 1 1 1))
+      (rotate (xyz 0 0 0))
+    )
+  )
+
+  (module Package_TO_SOT_THT:TO-92_Inline (layer F.Cu) (tedit 5A1DD157) (tstamp 5FCB2334)
+    (at 122.654 54.318)
+    (descr "TO-92 leads in-line, narrow, oval pads, drill 0.75mm (see NXP sot054_po.pdf)")
+    (tags "to-92 sc-43 sc-43a sot54 PA33 transistor")
+    (path /5FCA0DDC)
+    (fp_text reference Q1 (at 1.405 2.65) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value BC327 (at 1.27 2.79) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start 4 2.01) (end -1.46 2.01) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 4 2.01) (end 4 -2.73) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.46 -2.73) (end -1.46 2.01) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.46 -2.73) (end 4 -2.73) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -0.5 1.75) (end 3 1.75) (layer F.Fab) (width 0.1))
+    (fp_line (start -0.53 1.85) (end 3.07 1.85) (layer F.SilkS) (width 0.12))
+    (fp_arc (start 1.27 0) (end 1.27 -2.6) (angle 135) (layer F.SilkS) (width 0.12))
+    (fp_arc (start 1.27 0) (end 1.27 -2.48) (angle -135) (layer F.Fab) (width 0.1))
+    (fp_arc (start 1.27 0) (end 1.27 -2.6) (angle -135) (layer F.SilkS) (width 0.12))
+    (fp_arc (start 1.27 0) (end 1.27 -2.48) (angle 135) (layer F.Fab) (width 0.1))
+    (fp_text user %R (at 1.27 0) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad 1 thru_hole rect (at 0 0) (size 1.05 1.5) (drill 0.75) (layers *.Cu *.Mask)
+      (net 6 "Net-(Q1-Pad1)"))
+    (pad 3 thru_hole oval (at 2.54 0) (size 1.05 1.5) (drill 0.75) (layers *.Cu *.Mask)
+      (net 5 /3,3V))
+    (pad 2 thru_hole oval (at 1.27 0) (size 1.05 1.5) (drill 0.75) (layers *.Cu *.Mask)
+      (net 7 "Net-(Q1-Pad2)"))
+    (model ${KISYS3DMOD}/Package_TO_SOT_THT.3dshapes/TO-92_Inline.wrl
+      (at (xyz 0 0 0))
+      (scale (xyz 1 1 1))
+      (rotate (xyz 0 0 0))
+    )
+  )
+
+  (module Relay_THT:Relay_SPDT_Finder_36.11 (layer F.Cu) (tedit 5D3F5A07) (tstamp 5FCBE74A)
+    (at 108.953 80.164)
+    (descr "FINDER 36.11, SPDT relay, 10A, https://gfinder.findernet.com/public/attachments/36/EN/S36EN.pdf")
+    (tags "spdt relay")
+    (path /5FCAA0D9)
+    (fp_text reference K1 (at 8.791 -4.02) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value FINDER-36.11 (at 8 -9.6) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start 8.5 1.5) (end 3.5 1.5) (layer F.SilkS) (width 0.12))
+    (fp_line (start 8.5 -1.5) (end 8.5 1.5) (layer F.SilkS) (width 0.12))
+    (fp_line (start 3.5 -1.5) (end 8.5 -1.5) (layer F.SilkS) (width 0.12))
+    (fp_line (start 3.5 1.5) (end 3.5 -1.5) (layer F.SilkS) (width 0.12))
+    (fp_line (start 8.5 1.5) (end 3.5 -1.5) (layer F.SilkS) (width 0.12))
+    (fp_line (start 6 1.5) (end 6 6) (layer F.SilkS) (width 0.12))
+    (fp_line (start 6 -6) (end 6 -1.5) (layer F.SilkS) (width 0.12))
+    (fp_line (start 2.6 0) (end 2.6 3.7) (layer F.SilkS) (width 0.12))
+    (fp_line (start 9.5 0) (end 9.5 3.7) (layer F.SilkS) (width 0.12))
+    (fp_line (start 9.5 3.7) (end 2.6 3.7) (layer F.SilkS) (width 0.12))
+    (fp_line (start 11 0) (end 15.5 -2.7) (layer F.SilkS) (width 0.12))
+    (fp_line (start 9.5 0) (end 11 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 6 -6) (end 3.7 -6) (layer F.SilkS) (width 0.12))
+    (fp_line (start 2.6 0) (end 1.7 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 3.7 6) (end 6 6) (layer F.SilkS) (width 0.12))
+    (fp_line (start 14.2 -4.3) (end 14.2 -2) (layer F.SilkS) (width 0.12))
+    (fp_line (start 14.2 4.3) (end 14.2 2) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.75 7.85) (end 17.85 7.85) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 17.85 -7.85) (end 17.85 7.85) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.75 7.85) (end -1.75 -7.85) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 17.85 -7.85) (end -1.75 -7.85) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.4 7.6) (end -1.4 -7.6) (layer F.Fab) (width 0.1))
+    (fp_line (start 17.6 7.6) (end -1.4 7.6) (layer F.Fab) (width 0.1))
+    (fp_line (start 17.6 -7.6) (end 17.6 7.6) (layer F.Fab) (width 0.1))
+    (fp_line (start -1.4 -7.6) (end 17.6 -7.6) (layer F.Fab) (width 0.1))
+    (fp_line (start 17.7 7.7) (end -1.5 7.7) (layer F.SilkS) (width 0.12))
+    (fp_line (start 17.7 -7.7) (end 17.7 7.7) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.5 -7.7) (end 17.7 -7.7) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.5 -7.7) (end -1.5 -1.2) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.5 1.2) (end -1.5 7.7) (layer F.SilkS) (width 0.12))
+    (fp_text user %R (at 7.1 0.025) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad 11 thru_hole circle (at 0 0) (size 3 3) (drill 1.3) (layers *.Cu *.Mask)
+      (net 3 "Net-(J1-Pad4)"))
+    (pad A2 thru_hole circle (at 2 -6) (size 3 3) (drill 1.3) (layers *.Cu *.Mask)
+      (net 1 "Net-(D1-Pad2)"))
+    (pad 12 thru_hole circle (at 14.2 -6) (size 3 3) (drill 1.3) (layers *.Cu *.Mask)
+      (net 2 "Net-(J1-Pad5)"))
+    (pad 14 thru_hole circle (at 14.2 6) (size 3 3) (drill 1.3) (layers *.Cu *.Mask)
+      (net 4 "Net-(J1-Pad3)"))
+    (pad A1 thru_hole circle (at 2 6) (size 3 3) (drill 1.3) (layers *.Cu *.Mask)
+      (net 14 /5V))
+    (model ${KISYS3DMOD}/Relay_THT.3dshapes/Relay_SPDT_Finder_36.11.wrl
+      (at (xyz 0 0 0))
+      (scale (xyz 1 1 1))
+      (rotate (xyz 0 0 0))
+    )
+  )
+
+  (module Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical (layer F.Cu) (tedit 5A19A429) (tstamp 5FCB1F6A)
+    (at 112.03 55.156 180)
+    (descr "Through hole straight socket strip, 1x03, 2.54mm pitch, single row (from Kicad 4.0.7), script generated")
+    (tags "Through hole socket strip THT 1x03 2.54mm single row")
+    (path /5FCA9C46)
+    (fp_text reference J2 (at -1.881 -0.026) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value "Stecker LDO 5V-3,3V" (at 0 7.85) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start -1.8 6.85) (end -1.8 -1.8) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 1.75 6.85) (end -1.8 6.85) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 1.75 -1.8) (end 1.75 6.85) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.8 -1.8) (end 1.75 -1.8) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 0 -1.33) (end 1.33 -1.33) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.33 -1.33) (end 1.33 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.33 1.27) (end 1.33 6.41) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.33 6.41) (end 1.33 6.41) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.33 1.27) (end -1.33 6.41) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.33 1.27) (end 1.33 1.27) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.27 6.35) (end -1.27 -1.27) (layer F.Fab) (width 0.1))
+    (fp_line (start 1.27 6.35) (end -1.27 6.35) (layer F.Fab) (width 0.1))
+    (fp_line (start 1.27 -0.635) (end 1.27 6.35) (layer F.Fab) (width 0.1))
+    (fp_line (start 0.635 -1.27) (end 1.27 -0.635) (layer F.Fab) (width 0.1))
+    (fp_line (start -1.27 -1.27) (end 0.635 -1.27) (layer F.Fab) (width 0.1))
+    (fp_text user %R (at 0 2.54 90) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad 3 thru_hole oval (at 0 5.08 180) (size 1.7 1.7) (drill 1) (layers *.Cu *.Mask)
+      (net 15 /GND))
+    (pad 2 thru_hole oval (at 0 2.54 180) (size 1.7 1.7) (drill 1) (layers *.Cu *.Mask)
+      (net 5 /3,3V))
+    (pad 1 thru_hole rect (at 0 0 180) (size 1.7 1.7) (drill 1) (layers *.Cu *.Mask)
+      (net 14 /5V))
+    (model ${KISYS3DMOD}/Connector_PinSocket_2.54mm.3dshapes/PinSocket_1x03_P2.54mm_Vertical.wrl
+      (at (xyz 0 0 0))
+      (scale (xyz 1 1 1))
+      (rotate (xyz 0 0 0))
+    )
+  )
+
+  (module TerminalBlock_TE-Connectivity:TerminalBlock_TE_282834-5_1x05_P2.54mm_Horizontal (layer F.Cu) (tedit 5B1EC513) (tstamp 5FCB1AEA)
+    (at 110.077 59.004 270)
+    (descr "Terminal Block TE 282834-5, 5 pins, pitch 2.54mm, size 13.16x6.5mm^2, drill diamater 1.1mm, pad diameter 2.1mm, see http://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Customer+Drawing%7F282834%7FC1%7Fpdf%7FEnglish%7FENG_CD_282834_C1.pdf, script-generated using https://github.com/pointhi/kicad-footprint-generator/scripts/TerminalBlock_TE-Connectivity")
+    (tags "THT Terminal Block TE 282834-5 pitch 2.54mm size 13.16x6.5mm^2 drill 1.1mm pad 2.1mm")
+    (path /5FCA6822)
+    (fp_text reference J1 (at 5.111 -4.458 90) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value Schraubanschluss (at 5.08 4.37 90) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start 12.16 -3.75) (end -2 -3.75) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 12.16 3.75) (end 12.16 -3.75) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -2 3.75) (end 12.16 3.75) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -2 -3.75) (end -2 3.75) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.86 3.61) (end -1.46 3.61) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.86 2.97) (end -1.86 3.61) (layer F.SilkS) (width 0.12))
+    (fp_line (start 10.861 -0.835) (end 9.326 0.7) (layer F.Fab) (width 0.1))
+    (fp_line (start 10.995 -0.7) (end 9.46 0.835) (layer F.Fab) (width 0.1))
+    (fp_line (start 8.321 -0.835) (end 6.786 0.7) (layer F.Fab) (width 0.1))
+    (fp_line (start 8.455 -0.7) (end 6.92 0.835) (layer F.Fab) (width 0.1))
+    (fp_line (start 5.781 -0.835) (end 4.246 0.7) (layer F.Fab) (width 0.1))
+    (fp_line (start 5.915 -0.7) (end 4.38 0.835) (layer F.Fab) (width 0.1))
+    (fp_line (start 3.241 -0.835) (end 1.706 0.7) (layer F.Fab) (width 0.1))
+    (fp_line (start 3.375 -0.7) (end 1.84 0.835) (layer F.Fab) (width 0.1))
+    (fp_line (start 0.701 -0.835) (end -0.835 0.7) (layer F.Fab) (width 0.1))
+    (fp_line (start 0.835 -0.7) (end -0.701 0.835) (layer F.Fab) (width 0.1))
+    (fp_line (start 11.78 -3.37) (end 11.78 3.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.62 -3.37) (end -1.62 3.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.62 3.37) (end 11.78 3.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.62 -3.37) (end 11.78 -3.37) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.62 -2.25) (end 11.78 -2.25) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.5 -2.25) (end 11.66 -2.25) (layer F.Fab) (width 0.1))
+    (fp_line (start -1.62 2.85) (end 11.78 2.85) (layer F.SilkS) (width 0.12))
+    (fp_line (start -1.5 2.85) (end 11.66 2.85) (layer F.Fab) (width 0.1))
+    (fp_line (start -1.5 2.85) (end -1.5 -3.25) (layer F.Fab) (width 0.1))
+    (fp_line (start -1.1 3.25) (end -1.5 2.85) (layer F.Fab) (width 0.1))
+    (fp_line (start 11.66 3.25) (end -1.1 3.25) (layer F.Fab) (width 0.1))
+    (fp_line (start 11.66 -3.25) (end 11.66 3.25) (layer F.Fab) (width 0.1))
+    (fp_line (start -1.5 -3.25) (end 11.66 -3.25) (layer F.Fab) (width 0.1))
+    (fp_circle (center 10.16 0) (end 11.26 0) (layer F.Fab) (width 0.1))
+    (fp_circle (center 7.62 0) (end 8.72 0) (layer F.Fab) (width 0.1))
+    (fp_circle (center 5.08 0) (end 6.18 0) (layer F.Fab) (width 0.1))
+    (fp_circle (center 2.54 0) (end 3.64 0) (layer F.Fab) (width 0.1))
+    (fp_circle (center 0 0) (end 1.1 0) (layer F.Fab) (width 0.1))
+    (fp_text user %R (at 5.08 2 90) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (pad 5 thru_hole circle (at 10.16 0 270) (size 2.1 2.1) (drill 1.1) (layers *.Cu *.Mask)
+      (net 2 "Net-(J1-Pad5)"))
+    (pad 4 thru_hole circle (at 7.62 0 270) (size 2.1 2.1) (drill 1.1) (layers *.Cu *.Mask)
+      (net 3 "Net-(J1-Pad4)"))
+    (pad 3 thru_hole circle (at 5.08 0 270) (size 2.1 2.1) (drill 1.1) (layers *.Cu *.Mask)
+      (net 4 "Net-(J1-Pad3)"))
+    (pad 2 thru_hole circle (at 2.54 0 270) (size 2.1 2.1) (drill 1.1) (layers *.Cu *.Mask)
+      (net 15 /GND))
+    (pad 1 thru_hole rect (at 0 0 270) (size 2.1 2.1) (drill 1.1) (layers *.Cu *.Mask)
+      (net 14 /5V))
+    (model ${KISYS3DMOD}/TerminalBlock_TE-Connectivity.3dshapes/TerminalBlock_TE_282834-5_1x05_P2.54mm_Horizontal.wrl
+      (at (xyz 0 0 0))
+      (scale (xyz 1 1 1))
+      (rotate (xyz 0 0 0))
+    )
+  )
+
+  (module Diode_THT:D_DO-35_SOD27_P7.62mm_Horizontal (layer F.Cu) (tedit 5AE50CD5) (tstamp 5FCBE4EC)
+    (at 117.746 63.611)
+    (descr "Diode, DO-35_SOD27 series, Axial, Horizontal, pin pitch=7.62mm, , length*diameter=4*2mm^2, , http://www.diodes.com/_files/packages/DO-35.pdf")
+    (tags "Diode DO-35_SOD27 series Axial Horizontal pin pitch 7.62mm  length 4mm diameter 2mm")
+    (path /5FCA5316)
+    (fp_text reference D1 (at 3.907 -0.012) (layer F.SilkS)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text value 1N4148 (at 3.81 2.12) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_line (start 8.67 -1.25) (end -1.05 -1.25) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 8.67 1.25) (end 8.67 -1.25) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.05 1.25) (end 8.67 1.25) (layer F.CrtYd) (width 0.05))
+    (fp_line (start -1.05 -1.25) (end -1.05 1.25) (layer F.CrtYd) (width 0.05))
+    (fp_line (start 2.29 -1.12) (end 2.29 1.12) (layer F.SilkS) (width 0.12))
+    (fp_line (start 2.53 -1.12) (end 2.53 1.12) (layer F.SilkS) (width 0.12))
+    (fp_line (start 2.41 -1.12) (end 2.41 1.12) (layer F.SilkS) (width 0.12))
+    (fp_line (start 6.58 0) (end 5.93 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.04 0) (end 1.69 0) (layer F.SilkS) (width 0.12))
+    (fp_line (start 5.93 -1.12) (end 1.69 -1.12) (layer F.SilkS) (width 0.12))
+    (fp_line (start 5.93 1.12) (end 5.93 -1.12) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.69 1.12) (end 5.93 1.12) (layer F.SilkS) (width 0.12))
+    (fp_line (start 1.69 -1.12) (end 1.69 1.12) (layer F.SilkS) (width 0.12))
+    (fp_line (start 2.31 -1) (end 2.31 1) (layer F.Fab) (width 0.1))
+    (fp_line (start 2.51 -1) (end 2.51 1) (layer F.Fab) (width 0.1))
+    (fp_line (start 2.41 -1) (end 2.41 1) (layer F.Fab) (width 0.1))
+    (fp_line (start 7.62 0) (end 5.81 0) (layer F.Fab) (width 0.1))
+    (fp_line (start 0 0) (end 1.81 0) (layer F.Fab) (width 0.1))
+    (fp_line (start 5.81 -1) (end 1.81 -1) (layer F.Fab) (width 0.1))
+    (fp_line (start 5.81 1) (end 5.81 -1) (layer F.Fab) (width 0.1))
+    (fp_line (start 1.81 1) (end 5.81 1) (layer F.Fab) (width 0.1))
+    (fp_line (start 1.81 -1) (end 1.81 1) (layer F.Fab) (width 0.1))
+    (fp_text user K (at 0 -1.8) (layer F.Fab)
+      (effects (font (size 1 1) (thickness 0.15)))
+    )
+    (fp_text user %R (at 4.11 0 270) (layer F.Fab)
+      (effects (font (size 0.8 0.8) (thickness 0.12)))
+    )
+    (pad 2 thru_hole oval (at 7.62 0) (size 1.6 1.6) (drill 0.8) (layers *.Cu *.Mask)
+      (net 1 "Net-(D1-Pad2)"))
+    (pad 1 thru_hole rect (at 0 0) (size 1.6 1.6) (drill 0.8) (layers *.Cu *.Mask)
+      (net 14 /5V))
+    (model ${KISYS3DMOD}/Diode_THT.3dshapes/D_DO-35_SOD27_P7.62mm_Horizontal.wrl
+      (at (xyz 0 0 0))
+      (scale (xyz 1 1 1))
+      (rotate (xyz 0 0 0))
+    )
+  )
+
+  (gr_text 2020-12 (at 120.421 50.071) (layer B.Cu)
+    (effects (font (size 1 1) (thickness 0.15)) (justify mirror))
+  )
+  (gr_text Evil.2000 (at 108.094 50.177 -90) (layer B.Cu)
+    (effects (font (size 1 1) (thickness 0.15)) (justify mirror))
+  )
+  (gr_text Design: (at 110.04 54.069 -90) (layer B.Cu)
+    (effects (font (size 1 1) (thickness 0.15)) (justify mirror))
+  )
+  (gr_text "ESP-01 Wifi Relay" (at 119.274 47.382) (layer B.Cu)
+    (effects (font (size 1 1) (thickness 0.15)) (justify mirror))
+  )
+  (gr_text "4:C 5:NC =>" (at 107.976 51.81 -90) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (gr_text "1:5V 2:GND 3:NO" (at 115.44 47.105 180) (layer F.SilkS)
+    (effects (font (size 1 1) (thickness 0.15)))
+  )
+  (gr_line (start 127 45.72) (end 127 88.9) (layer Edge.Cuts) (width 0.1))
+  (gr_line (start 106.68 45.72) (end 127 45.72) (layer Edge.Cuts) (width 0.1))
+  (gr_line (start 106.68 88.9) (end 106.68 45.72) (layer Edge.Cuts) (width 0.1))
+  (gr_line (start 127 88.9) (end 106.68 88.9) (layer Edge.Cuts) (width 0.1))
+
+  (segment (start 117.105 54.318) (end 117.105 55.668) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 125.366 63.611) (end 125.366 62.211) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 125.366 62.211) (end 123.648 62.211) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 123.648 62.211) (end 117.105 55.668) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 112.953001 76.164001) (end 110.953 74.164) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 124.113001 76.164001) (end 112.953001 76.164001) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 126.328001 73.949001) (end 124.113001 76.164001) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 126.328001 64.573001) (end 126.328001 73.949001) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 125.366 63.611) (end 126.328001 64.573001) (width 0.6) (layer B.Cu) (net 1))
+  (segment (start 115.077 74.164) (end 123.153 74.164) (width 1.8) (layer B.Cu) (net 2))
+  (segment (start 110.077 69.164) (end 115.077 74.164) (width 1.8) (layer B.Cu) (net 2))
+  (segment (start 107.926999 79.137999) (end 108.953 80.164) (width 1.8) (layer F.Cu) (net 3))
+  (segment (start 107.926999 67.289077) (end 107.926999 79.137999) (width 1.8) (layer F.Cu) (net 3))
+  (segment (start 108.592076 66.624) (end 107.926999 67.289077) (width 1.8) (layer F.Cu) (net 3))
+  (segment (start 110.077 66.624) (end 108.592076 66.624) (width 1.8) (layer F.Cu) (net 3))
+  (segment (start 115.583999 78.594999) (end 123.153 86.164) (width 1.8) (layer F.Cu) (net 4))
+  (segment (start 115.583999 68.106075) (end 115.583999 78.594999) (width 1.8) (layer F.Cu) (net 4))
+  (segment (start 111.561924 64.084) (end 115.583999 68.106075) (width 1.8) (layer F.Cu) (net 4))
+  (segment (start 110.077 64.084) (end 111.561924 64.084) (width 1.8) (layer F.Cu) (net 4))
+  (segment (start 112.03 52.616) (end 115.6647 52.616) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 115.6647 52.616) (end 116.0167 52.968) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 116.0167 52.968) (end 125.194 52.968) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 125.194 54.318) (end 125.194 52.968) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 116.0167 52.968) (end 116.0167 57.2132) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 121.248001 68.346999) (end 119.986 69.609) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 123.803999 68.346999) (end 121.248001 68.346999) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 125.066 69.609) (end 123.803999 68.346999) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 121.248001 62.444501) (end 121.248001 68.346999) (width 0.6) (layer B.Cu) (net 5))
+  (segment (start 116.0167 57.2132) (end 121.248001 62.444501) (width 0.6) (layer B.Cu) (net 5))
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diff --git a/cicurit/wifi_relais.sch b/cicurit/wifi_relais.sch
new file mode 100644
index 0000000..cd956ff
--- /dev/null
+++ b/cicurit/wifi_relais.sch
@@ -0,0 +1,210 @@
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diff --git a/cicurit/wifi_relais_bottom.png b/cicurit/wifi_relais_bottom.png
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index 0000000..a408a8c
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diff --git a/cicurit/wifi_relais_top.png b/cicurit/wifi_relais_top.png
new file mode 100644
index 0000000..a59a574
Binary files /dev/null and b/cicurit/wifi_relais_top.png differ
diff --git a/src/relais.cpp b/src/relais.cpp
new file mode 100644
index 0000000..efbb226
--- /dev/null
+++ b/src/relais.cpp
@@ -0,0 +1,169 @@
+#include <ESP8266WiFi.h>
+#include <PubSubClient.h>
+
+// Name and password of the WLAN access point.
+#define SSID "YourWiFiSSIDhere" // Carmageddon
+#define PASSWORD "OhAndYourWiFiPasswordHere;-)"
+
+#define MQTT_BROKER "192.168.0.25"
+#define MQTT_PORT 1883
+
+// Relais status flag
+uint8_t relais_status = 0;
+
+// Variable for the MQTT Topic where the on/off command arrvies
+char mqtt_topic[64];
+// Variable for the MQTT topic where the current relais state is published to
+char mqtt_topic_state[64];
+
+WiFiClient espClient;
+PubSubClient mqtt(espClient);
+
+void Serialprint(const char *input...) {
+    va_list args;
+    va_start(args, input);
+    for (const char *i = input; *i != 0; ++i) {
+        if (*i != '%') {
+            Serial.print(*i);
+            continue;
+        }
+        switch (*(++i)) {
+            case '%':
+                Serial.print('%');
+                break;
+            case 's':
+                Serial.print(va_arg(args, char*));
+                break;
+            case 'd':
+                Serial.print(va_arg(args, int), DEC);
+                break;
+            case 'b':
+                Serial.print(va_arg(args, int), BIN);
+                break;
+            case 'o':
+                Serial.print(va_arg(args, int), OCT);
+                break;
+            case 'x':
+                Serial.print(va_arg(args, int), HEX);
+                break;
+            case 'f':
+                Serial.print(va_arg(args, double), 2);
+                break;
+        }
+    }
+    va_end(args);
+}
+
+void publish_relais_state() {
+    char payload[7];
+    if(relais_status==0) {
+        sprintf(payload,"%s","off");
+    } else {
+        sprintf(payload,"%s","on");
+    }
+    mqtt.publish(mqtt_topic_state,(byte*) payload,strlen(payload),true);
+    //mqtt.publish(mqtt_topic,payload,NULL,true);
+}
+
+void onWiFiEvent(WiFiEvent_t event) {
+    switch (event) {
+        case WIFI_EVENT_STAMODE_CONNECTED:
+            Serial.println("WiFi connection established.");
+            break;
+        case WIFI_EVENT_STAMODE_DISCONNECTED:
+            Serial.println("WiFi disconnected.");
+            break;
+        case WIFI_EVENT_STAMODE_GOT_IP:
+            Serialprint("WiFi IP recieved: %s\r\n", WiFi.localIP().toString().c_str());
+            break;
+        case WIFI_EVENT_STAMODE_DHCP_TIMEOUT:
+            Serial.println("WiFi DHCP timeout.");
+            break;
+        default:
+            break;
+    }
+}
+
+/**
+ * This callback is registered an run when data for a subscribed topic arrives.
+ * In this case, the payload can only be "on" and "off" which switches the relais
+ * to the corresponding state.
+ * (Maybe this can be tuned a bit: directly use payload by casting it from byte to char.)
+ */
+void mqtt_data_arrived(char *topic, byte *payload, unsigned int length) {
+    char buf[32];
+    snprintf(buf, length + 1, "%s", payload);
+    Serial.println(buf);
+    if (strcmp(buf, "on") == 0) {
+        // LOW (0V) level for "ON", because schematic inverts the signal
+        digitalWrite(2,LOW);
+        relais_status=1;
+        publish_relais_state();
+    } else if (strcmp(buf, "off") == 0) {
+        // HIGH (3,3V) level for "OFF", because schematic inverts the signal
+        digitalWrite(2,HIGH);
+        relais_status=0;
+        publish_relais_state();
+    }
+}
+
+/**
+ * Connect to the MQTT broker if not already connected.
+ * When connecting, register the last will topic, QoS, retained flag and last will also.
+ * This is done to tell any subscriber that the relay is off when it diconnects from the broker.
+ */
+void mqtt_connect() {
+    if (!mqtt.connected()) {
+        //Serialprint("MQTT connecting to: %s\r\n",MQTT_BROKER);
+        if (!mqtt.connect(WiFi.hostname().c_str(), mqtt_topic_state, 0, true, "off")) {
+            // connect using Hostname as Client-ID, last will, will QoS and will retianed flag
+            // Leave the function if the connection could not be established (broker down).
+            return;
+        }
+    }
+    mqtt.subscribe(mqtt_topic);
+}
+
+void setup() {
+    pinMode(2,OUTPUT);
+    digitalWrite(2,HIGH);
+
+
+    // put your setup code here, to run once:
+    Serial.begin(9600);
+
+    WiFi.onEvent(onWiFiEvent, WIFI_EVENT_STAMODE_CONNECTED);
+    WiFi.onEvent(onWiFiEvent, WIFI_EVENT_STAMODE_DISCONNECTED);
+    WiFi.onEvent(onWiFiEvent, WIFI_EVENT_STAMODE_GOT_IP);
+    WiFi.onEvent(onWiFiEvent, WIFI_EVENT_STAMODE_DHCP_TIMEOUT);
+
+    // Connect to Wifi
+    WiFi.mode(WIFI_STA);
+    WiFi.begin(SSID, PASSWORD);
+    if (WiFi.waitForConnectResult(60000) < 0) {
+        ESP.reset();
+    }
+
+    mqtt.setServer(MQTT_BROKER, MQTT_PORT);
+
+    // Set the topic for recieving the commands and the topic for publishing the
+    // relay state (on or off) to the hostname of the ESP (ESP-1A2B3C).
+    sprintf(mqtt_topic, "/%s/relay", WiFi.hostname().c_str());
+    sprintf(mqtt_topic_state, "/%s/relay/state", WiFi.hostname().c_str());
+
+    // Register the MQTT callback function which recieves the data from the topic
+    mqtt.setCallback(mqtt_data_arrived);
+
+    // Now, connect to the MQTT broker.
+    mqtt_connect();
+
+    publish_relais_state();
+}
+
+void loop() {
+    if (!mqtt.loop()) {
+        // loop() returns false if connection was closed
+        // try to reconnect
+        mqtt_connect();
+    }
+}