From a68a207fa1b6d9acef8c531aab2166a6d0c0ecbd Mon Sep 17 00:00:00 2001
From: Mathieu Maret <mathieu.maret@gmail.com>
Date: Fri, 8 Jul 2016 16:04:20 +0200
Subject: [PATCH] Suggest SSID name when configuring Wifi Details

---
 WifiControlSensor/WebServer.ino | 31 ++++++++++++++++++++++++++++---
 1 file changed, 28 insertions(+), 3 deletions(-)

diff --git a/WifiControlSensor/WebServer.ino b/WifiControlSensor/WebServer.ino
index 57c23f8..e278922 100644
--- a/WifiControlSensor/WebServer.ino
+++ b/WifiControlSensor/WebServer.ino
@@ -45,6 +45,27 @@ void WebSendError(const char *error) {
   server.send(500, "text/plain", error);
 }
 
+void WebBuildSSIDList(String &datalist){
+  int n = WiFi.scanNetworks();
+  datalist = "<datalist id=\"scan_ssid\">";
+  // sort by RSSI
+  int indices[n];
+  for (int i = 0; i < n; i++) {
+    indices[i] = i;
+  }
+  for (int i = 0; i < n; i++) {
+    for (int j = i + 1; j < n; j++) {
+      if (WiFi.RSSI(indices[j]) > WiFi.RSSI(indices[i])) {
+        std::swap(indices[i], indices[j]);
+      }
+    }
+  }
+  for (int i = 0; i < n; ++i){
+    datalist += "<option value=\""+WiFi.SSID(indices[i])+"\">";
+  }
+  datalist += "</datalist>";
+}
+
 void WebHandleSetup() {
   uint8_t mode;
   char *confSsid = "";
@@ -61,13 +82,17 @@ void WebHandleSetup() {
   uint32_t dns = 0;
   uint32_t dns2 = 0;
 
+  String ssidlist;
+  WebBuildSSIDList(ssidlist);
+
   EepromReadConfig(mode, &confSsid, &confPassword, &confHost, &mqttServer, &mqttUser, &mqttPasswd, mqttPort, ip_config, ip, gw, mask, dns, dns2);
 
   server.send(200, "text/html", "<form action=\"/save\" method=\"get\">"
               "<fieldset>"
               "<legend>Wifi configuration:</legend>"
-              "<div><label for=\"ssid\">Wifi SSID :</label> <br/><input type=\"text\" name=\"ssid\" value=\"" + String(confSsid) + "\" /></div>"
-              "<div><label for=\"password\">Wifi Password :</label><br/><input type=\"password\" name=\"password\" /> </div>"
+              "<div><label for=\"ssid\">Wifi SSID :</label> <br/><input list=\"scan_ssid\" type=\"text\" name=\"ssid\" value=\"" + String(confSsid) + "\" /></div>"
+              "" + ssidlist + ""
+              "<div><label for=\"password\">Wifi Password :</label><br/><input type=\"password\" name=\"password\" style=\"border-color:red\" /> </div>"
               "<div><label for=\"host\">Hostname :</label><br/><input type=\"text\" name=\"host\" value=\"" + String(confHost) + "\" /> </div>"
               "</fieldset>"
               "<fieldset>"
@@ -83,7 +108,7 @@ void WebHandleSetup() {
               "<legend>MQTT:</legend>"
               "<div><label for=\"mqttServer\">Server :</label><br/><input type=\"text\" name=\"mqttServer\" value=\"" + String(mqttServer) + "\" /> </div>"
               "<div><label for=\"mqttUser\">Username :</label><br/><input type=\"text\" name=\"mqttUser\" value=\"" + String(mqttUser) + "\" /> </div>"
-              "<div><label for=\"mqttPasswd\">Password :</label><br/><input type=\"password\" name=\"mqttPasswd\" /> </div>"
+              "<div><label for=\"mqttPasswd\">Password :</label><br/><input type=\"password\" name=\"mqttPasswd\" style=\"border-color:red\" /> </div>"
               "<div><label for=\"mqttPort\">Port :</label><br/><input type=\"text\" name=\"mqttPort\" value=\"" + String(mqttPort) + "\" /> </div>"
               "</fieldset>"
               "<div class=\"button\"> <button type=\"submit\">Save</button></div>"