Handling MQTT commands formatted like HTTP requests.

include/prototypes.h

@@ -13,16 +13,20 @@ extern std::list<Edge*> edges;
 extern std::vector<Corner*> corners;
 
 extern CRGB leds[LED_COUNT];
+extern CRGB color;
 
 enum AnimationMode {
 	AM_CORNERS,
 	AM_FIRST_CORNER,
 	AM_NODES,
 	AM_FIRST_NODE,
-	AM_FLASH
+	AM_FLASH,
+	AM_OFF,
+	AM_ERROR,
+	AM_NONE
 };
 
 extern AnimationMode mode;
 extern AnimationMode temp_mode;
 extern unsigned long temp_mode_until;
-
+extern int return_to_brightness;

src/main.cpp

@@ -14,10 +14,12 @@ std::list<Edge*> edges;
 std::vector<Corner*> corners;
 
 CRGB leds[LED_COUNT];
+CRGB color = CRGB::Pink;
 
 AnimationMode mode = AM_CORNERS;
 AnimationMode temp_mode;
 unsigned long temp_mode_until;
+int return_to_brightness = -1;
 
 unsigned long last_loop = 0;
 
@@ -136,6 +138,10 @@ void loop() {
 					active_mode = temp_mode;
 				} else {
 					temp_mode_until = 0;
+					if (return_to_brightness != -1) {
+						FastLED.setBrightness(return_to_brightness);
+						return_to_brightness = -1;
+					}
 				}
 			}
 
@@ -180,8 +186,18 @@ void loop() {
 				}
 
 				if (millis() / 1000 > last_loop / 1000) {
-					nodes[0]->blend_to(((millis() / 1000) % 2 == 0) ? CRGB::Black : CRGB::Orange, 0, 64);
+					nodes[0]->blend_to(((millis() / 1000) % 2 == 0) ? CRGB::Black : color, 0, 64);
 				}
+
+			} else if (active_mode == AM_OFF) {
+				for(Node* node : nodes) {
+					node->set_color(CRGB::Black);
+				}
+			} else { // This includes AM_ERROR
+				for(Node* node : nodes) {
+					node->set_color(CRGB::Black);
+				}
+				nodes[0]->set_color(CRGB::Red);
 			}
 
 			last_loop = millis();

src/mqtt.cpp

@@ -20,21 +20,53 @@ LOGln("Connecting to MQTT broker...");
 void callback(char* topic, byte* pl, unsigned int length) {
     pl[length] = 0;
     String payload((char*)pl);
+    // Syntax: key=value&key2=value2...
     uint16_t duration = 0;
-    int cp = payload.indexOf(",");
-    if (cp != -1) {
-        duration = payload.substring(cp+1).toInt();
-        payload = payload.substring(0, cp);
-    }
-    AnimationMode am;
-    if (payload.equals("corners")) am = AM_CORNERS;
-    else if (payload.equals("nodes")) am = AM_NODES;
+    AnimationMode new_mode = AM_NONE;
+    String current_part;
+    while (payload.length() > 0) {
+        int offset = payload.indexOf("&");
+        if (offset != -1) {
+            current_part = payload.substring(0, offset);
+            payload = payload.substring(offset + 1);
+        }
+        offset = current_part.indexOf("=");
+        if (offset==-1) continue;
+        String key = current_part.substring(0, offset);
+        String value = current_part.substring(offset+1);
 
-    if (duration > 0) {
-        temp_mode = am;
-        temp_mode_until = millis() + duration*1000;
-    } else {
-        mode = am;
+        if (key.equals("mode")) {
+            if (value.equals("nodes")) { new_mode = AM_NODES; }
+            else if (value.equals("first_node")) { new_mode = AM_FIRST_NODE; }
+            else if (value.equals("corners")) { new_mode = AM_CORNERS; }
+            else if (value.equals("first_corner")) { new_mode = AM_FIRST_CORNER; }
+            else if (value.equals("off")) { new_mode = AM_OFF; }
+            else if (value.equals("flash")) { new_mode = AM_FLASH; }
+            else { LOGln("Unknown mode '%s'.", value.c_str()); }
+        } else if (key.equals("duration")) {
+            duration = value.toInt();
+        } else if (key.equals("brightness")) {
+            if (temp_mode_until == 0) {
+                return_to_brightness = FastLED.getBrightness();
+            }
+            FastLED.setBrightness(value.toInt());
+        } else if (key.equals("color")) {
+            if (value.equals("red")) { color = CRGB::Red; }
+            else if (value.equals("green")) { color = CRGB::Green; }
+            else if (value.equals("blue")) { color = CRGB::Blue; }
+            else { LOGln("Unknown color name %s.", value.c_str());}
+        } else {
+            LOGln("Unknown key '%s'. (For reference: Value is '%s'.)", key.c_str(), value.c_str());
+        }
+    }
+
+    if (new_mode != AM_NONE) {
+        if (duration > 0) {
+            temp_mode = new_mode;
+            temp_mode_until = millis() + duration*1000;
+        } else {
+            mode = new_mode;
+        }
     }
 }