Added JSON info to doc and multiple relay control.

usermods/multi_relay/readme.md

@@ -16,6 +16,12 @@ Examples
 1. 4 relays at all, relay 2 will be toggled: `http://[device-ip]/relays?toggle=0,1,0,0`
 2. 3 relays at all, relay 1&3 will be switched on: `http://[device-ip]/relays?switch=1,0,1`
 
+## JSON API
+You can switch relay state using the following JSON object transmitted to: `http://[device-ip]/json`
+
+Switch relay 0 on: `{MultiRelay:{relay:0,on:true}}`
+Switch relay4 3 & 4 off: `{"MultiRelay":[{"relay":2,"on":false},{"relay":3,"on":false}]}`
+
 ## MQTT API
 
 wled/deviceMAC/relay/0/command on|off|toggle

usermods/multi_relay/usermod_multi_relay.h

@@ -443,6 +443,13 @@ class MultiRelay : public Usermod {
         if (usermod["on"].is<bool>() && usermod[FPSTR(_relay_str)].is<int>() && usermod[FPSTR(_relay_str)].as<int>()>=0) {
           switchRelay(usermod[FPSTR(_relay_str)].as<int>(), usermod["on"].as<bool>());
         }
+      } else if (root[FPSTR(_name)].is<JsonArray>()) {
+        JsonArray relays = root[FPSTR(_name)].as<JsonArray>();
+        for (JsonVariant r : relays) {
+          if (r["on"].is<bool>() && r[FPSTR(_relay_str)].is<int>() && r[FPSTR(_relay_str)].as<int>()>=0) {
+            switchRelay(r[FPSTR(_relay_str)].as<int>(), r["on"].as<bool>());
+          }
+        }
       }
     }