Check wifi connection before trying to connect to influxdb host

code/espurna/influxdb.ino

@@ -12,38 +12,41 @@ Copyright (C) 2017 by Xose Pérez <xose dot perez at gmail dot com>
 #include "SyncClient.h"
 
 bool influxDBEnabled = false;
+SyncClient _influxClient;
 
 template<typename T> bool influxDBSend(const char * topic, T payload) {
 
     if (!influxDBEnabled) return true;
+    if (!wifiConnected() || (WiFi.getMode() != WIFI_STA)) return true;
 
-    SyncClient client;
-    if (!client.connect(getSetting("idbHost").c_str(), getSetting("idbPort", INFLUXDB_PORT).toInt())) {
+    DEBUG_MSG_P(("[INFLUXDB] Sending\n"));
+
+    _influxClient.setTimeout(2);
+    if (!_influxClient.connect(getSetting("idbHost").c_str(), getSetting("idbPort", INFLUXDB_PORT).toInt())) {
         DEBUG_MSG_P(("[INFLUXDB] Connection failed\n"));
         return false;
     }
-    client.setTimeout(2);
 
-    char data[64];
+    char data[128];
     sprintf(data, "%s,device=%s value=%s", topic, getSetting("hostname", HOSTNAME).c_str(), String(payload).c_str());
     DEBUG_MSG_P(("[INFLUXDB] Data: %s\n"), data);
 
-    char request[250];
+    char request[256];
     sprintf(request, "POST /write?db=%s&u=%s&p=%s HTTP/1.1\r\nHost: %s:%d\r\nContent-Length: %d\r\n\r\n%s",
         getSetting("idbDatabase").c_str(), getSetting("idbUsername").c_str(), getSetting("idbPassword").c_str(),
         getSetting("idbHost").c_str(), getSetting("idbPort", INFLUXDB_PORT).toInt(),
         strlen(data), data);
 
-    if (client.printf(request) > 0) {
-        while (client.connected() && client.available() == 0) delay(1);
-        while (client.available()) client.read();
-        if (client.connected()) client.stop();
+    if (_influxClient.printf(request) > 0) {
+        while (_influxClient.connected() && _influxClient.available() == 0) delay(1);
+        while (_influxClient.available()) _influxClient.read();
+        if (_influxClient.connected()) _influxClient.stop();
         return true;
     }
 
-    client.stop();
+    _influxClient.stop();
     DEBUG_MSG_P(("[INFLUXDB] Sent failed\n"));
-    while (client.connected()) delay(0);
+    while (_influxClient.connected()) delay(0);
     return false;
 
 }