extended function to find connected blinkstick(s)

libs/blinkstick.js

@@ -15,15 +15,18 @@ const LEDS = new Map();
 
 let stop = false;
 
-// find a connected blinkstick
-function findBlinkstick() {
-    return new Promise((resolve, reject) => {
-        let led = blinkstick.findFirst();
-        if (led === undefined) {
-            reject('could not find any blinkstick');
+// find connected blinkstick(s)
+async function findBlinkstick(index) {
+    let blinksticks = blinkstick.findAll();
+    if (blinksticks.length === 0) {
+        throw new Error('could not find any blinkstick');
+    }
+    if (index === undefined) {
+        index = 0;
+    }
+    if (index <= blinksticks.length) {
+        return blinksticks[index];
     }
-        resolve(led);
-    });
 }
 
 // simple animation (set the color / morph to color)
@@ -69,7 +72,6 @@ async function complex(config) {
         return complex(config);
     } catch (err) {
         logger.error(err);
-        return err;
     }
 }
 
@@ -91,7 +93,8 @@ async function powerOff(config) {
         }
         return {status: 'ok', indices: indices, time: (new Date().getTime() - config.timestamp) + 'ms'};
     } catch (err) {
-        return err;
+        logger.error(err);
+        throw err;
     }
 }
 
@@ -126,7 +129,7 @@ async function singleAnimation(config, index) {
             }
         });
     } catch (err) {
-        return err;
+        throw err;
     }
 }