From ba0fc47c140e080cb82213b3ad975c5a9b01c934 Mon Sep 17 00:00:00 2001
From: Miguel Matey Sanz <al341802@uji.es>
Date: Tue, 2 Aug 2022 15:26:40 +0200
Subject: [PATCH] feat(plugin): add a way to know if there are connected nodes
 without asking their capabilities.

---
 README.md                                        |  9 +++++----
 .../node/discoverer/node-discoverer.android.ts   | 16 ++++++++++++++++
 src/internal/node/discoverer/node-discoverer.ts  |  1 +
 3 files changed, 22 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index 3491e8f..edccd98 100644
--- a/README.md
+++ b/README.md
@@ -255,10 +255,11 @@ export const defaultConfig = {
 
 ### [`NodeDiscoverer`](src/internal/node/discoverer/node-discoverer.android.ts)
 
-| Function                                    | Return type                | Description                                                                                                                            |
-|---------------------------------------------|----------------------------|----------------------------------------------------------------------------------------------------------------------------------------|
-| `getLocalNode()`                            | `Promise<Node>`            | Get a reference to the local node (smartphone).                                                                                        |
-| `getConnectedNodes(timeout: number = 5000)` | `Promise<NodeDiscovered[]` | Get the currently connected nodes. Timeout indicates the maximum wait time for the connected nodes to communicate with the smartphone. |
+| Function                                    | Return type                | Description                                                                                                                                                        |
+|---------------------------------------------|----------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| `getLocalNode()`                            | `Promise<Node>`            | Get a reference to the local node (smartphone).                                                                                                                    |
+| `areConnectedNodes()`                       | `Promise<boolean>`         | Returns true if there are connected nodes.                                                                                                                         |
+| `getConnectedNodes(timeout: number = 5000)` | `Promise<NodeDiscovered[]` | Get the currently connected nodes and their available sensors. Timeout indicates the maximum wait time for the connected nodes to communicate with the smartphone. |
 
 #### [`Node`](src/internal/node/index.ts)
 
diff --git a/src/internal/node/discoverer/node-discoverer.android.ts b/src/internal/node/discoverer/node-discoverer.android.ts
index 884d2f4..723fb3c 100644
--- a/src/internal/node/discoverer/node-discoverer.android.ts
+++ b/src/internal/node/discoverer/node-discoverer.android.ts
@@ -37,6 +37,22 @@ export class AndroidNodeDiscoverer implements NodeDiscoverer {
         });
     }
 
+    public areConnectedNodes(): Promise<boolean> {
+        const connectedNodes = this.nodeClient.getConnectedNodes();
+        return new Promise<boolean>((resolve) => {
+            connectedNodes.addOnCompleteListener(new OnCompleteListener({
+                onComplete: task => {
+                    if (!task.isSuccessful()) {
+                        return resolve(false);
+                    }
+
+                    const nodes = task.getResult();
+                    resolve(nodes.size() !== 0);
+                }
+            }));
+        });
+    }
+
     public getConnectedNodes(timeout: number = 5000): Promise<NodeDiscovered[]> {
         return firstValueFrom(
             this.scanConnectedNodes(timeout)
diff --git a/src/internal/node/discoverer/node-discoverer.ts b/src/internal/node/discoverer/node-discoverer.ts
index cdfdcee..ff94da0 100644
--- a/src/internal/node/discoverer/node-discoverer.ts
+++ b/src/internal/node/discoverer/node-discoverer.ts
@@ -2,6 +2,7 @@ import { Node } from "../index";
 
 export interface NodeDiscoverer {
     getLocalNode(): Promise<Node>;
+    areConnectedNodes(): Promise<boolean>;
     getConnectedNodes(timeout?: number): Promise<NodeDiscovered[]>;
 }