Add Shelly / TP-Link device discovery

This announces Shelly and TP-Link devices with an empty MQTT message.
This makes it possible that a client can display the available devices.

1 files changed, 26 insertions, 2 deletions

diff --git a/README.md b/README.md
index cb3be93..e0555a0 100644
--- a/README.md
+++ b/README.md
@@ -118,9 +118,21 @@ For all terms not explained here see the [MQTT version 3.1.1 documentation][9].
     - `open`: contact is open
     - `closed`: contact is closed
 
+### `/cover/<id>`
+
+- description: Discovery of Shelly 2PM Gen3 covers
+- direction: Sia server to client
+- Quality of Service: QoS 1 (at least once)
+- retained: yes
+- receives will message: no
+- topic parameters:
+    - `id`: ID of the Shelly 2PM Gen3 cover
+- payloads:
+    - `exists`: a device with the given ID exists
+
 ### `/cover/<id>/movement`
 
-- description: Allows control of Shelly 2PM Gen3 covers
+- description: Control of Shelly 2PM Gen3 covers
 - direction: client to Sia server
 - Quality of Service: QoS 2 (exactly once)
 - retained: no
@@ -132,9 +144,21 @@ For all terms not explained here see the [MQTT version 3.1.1 documentation][9].
     - `retract`: cover decreases the covering surface
     - `stop`: cover stops current motion if given
 
+### `/plug/<id>`
+
+- description: Discovery of TP-Link HS100 Wi-Fi plugs
+- direction: Sia server to client
+- Quality of Service: QoS 1 (at least once)
+- retained: yes
+- receives will message: no
+- topic parameters:
+    - `id`: ID of the TP-Link HS100 Wi-Fi plug
+- payloads:
+    - `exists`: a device with the given ID exists
+
 ### `/plug/<id>/action`
 
-- description: Implements control of tp-link HS100 Wi-Fi plugs
+- description: Control of TP-Link HS100 Wi-Fi plugs
 - direction: client to Sia server
 - Quality of Service: QoS 2 (exactly once)
 - retained: no