Add `opts.size` to `dht.ping()` (#49)

README.md

@@ -240,9 +240,17 @@ Options include:
 
 Normally you'd set the token when commiting to the dht in the query's commit hook.
 
-#### `reply = await node.ping(to)`
+#### `reply = await node.ping(to, [options])`
 
-Sugar for `dht.request({ command: 'ping' }, to)`
+Sugar for `dht.request({ command: 'ping' }, to, options)`
+
+Additional options include:
+
+```js
+{
+  size: 0, // size of the value buffer, filled with zeroes
+}
+```
 
 #### `stream = node.query({ target, command, value }, [options])`
 

index.js

@@ -143,7 +143,11 @@ class DHT extends EventEmitter {
   }
 
   ping ({ host, port }, opts) {
-    const req = this.io.createRequest({ id: null, host, port }, null, true, PING, null, null)
+    let value = null
+
+    if (opts && opts.size && opts.size > 0) value = b4a.alloc(opts.size)
+
+    const req = this.io.createRequest({ id: null, host, port }, null, true, PING, null, value)
     return this._requestToPromise(req, opts)
   }