add example for USG traffic statistics (#3)

* add example for USG traffic statistics

* fix bps

examples/usg-traffic-stats.php

@@ -0,0 +1,39 @@
+<?php
+
+require __DIR__ . '/../vendor/autoload.php';
+$config = require 'config.php';
+
+use JVDS\UnifiApiClient\Client;
+use GuzzleHttp\Client as HttpClient;
+use GuzzleHttp\Exception\RequestException;
+
+$apiClient = new Client(new HttpClient(['base_uri' => $config['base_uri']]));
+
+try {
+
+    // login to the unifi controller API
+    $apiClient->login($config['username'], $config['password']);
+
+    // Fetch statistics for the given site
+    $responseBody = $apiClient
+        ->health($config['site'])
+        ->getBody()
+        ->getContents();
+
+    $data = json_decode($responseBody, true);
+    echo "Latency: ".$data['data'][2]['latency']." ms\n";
+    echo "RX     : ".round(($data['data'][2]['rx_bytes-r']/1024/1024*8), 2)." Mb/s\n";
+    echo "TX     : ".round(($data['data'][2]['tx_bytes-r']/1024/1024*8), 2)." Mb/s\n";
+    $apiClient->logout();
+
+} catch (RequestException $e) {
+    echo $e->getMessage() . PHP_EOL;
+
+    echo '----- Request ------' . PHP_EOL;
+    echo $e->getRequest()->getBody()->getContents();
+    echo PHP_EOL;
+
+    echo '----- Response ------' . PHP_EOL;
+    echo $e->hasResponse() ? $e->getResponse()->getBody()->getContents() : '- no response -';
+    echo PHP_EOL;
+}