diff --git a/examples/Ethernet/receiver/receiver.ino b/examples/Ethernet/receiver/receiver.ino
index 1c7a2d7..192a1c3 100644
--- a/examples/Ethernet/receiver/receiver.ino
+++ b/examples/Ethernet/receiver/receiver.ino
@@ -8,29 +8,26 @@ ArtnetReceiver artnet;
 uint32_t universe1 = 1;
 uint32_t universe2 = 2;
 
-void callback(uint8_t* data, uint16_t size)
-{
+void callback(const uint8_t* data, const uint16_t size) {
     // you can also use pre-defined callbacks
 }
 
-void setup()
-{
+void setup() {
     Serial.begin(115200);
 
     Ethernet.begin(mac, ip);
     artnet.begin();
 
     // if Artnet packet comes to this universe, this function is called
-    artnet.subscribe(universe1, [&](uint8_t* data, uint16_t size)
-    {
+    artnet.subscribe(universe1, [&](const uint8_t* data, const uint16_t size) {
         Serial.print("artnet data (universe : ");
         Serial.print(universe1);
         Serial.print(", size = ");
         Serial.print(size);
         Serial.print(") :");
-        for (size_t i = 0; i < size; ++i)
-        {
-            Serial.print(data[i]); Serial.print(",");
+        for (size_t i = 0; i < size; ++i) {
+            Serial.print(data[i]);
+            Serial.print(",");
         }
         Serial.println();
     });
@@ -39,7 +36,6 @@ void setup()
     artnet.subscribe(universe2, callback);
 }
 
-void loop()
-{
-    artnet.parse(); // check if artnet packet has come and execute callback
+void loop() {
+    artnet.parse();  // check if artnet packet has come and execute callback
 }
diff --git a/examples/Ethernet/send_receive/send_receive.ino b/examples/Ethernet/send_receive/send_receive.ino
index eaa2888..91324c8 100644
--- a/examples/Ethernet/send_receive/send_receive.ino
+++ b/examples/Ethernet/send_receive/send_receive.ino
@@ -16,8 +16,7 @@ const uint16_t size = 512;
 uint8_t data[size];
 uint8_t value = 0;
 
-void setup()
-{
+void setup() {
     Serial.begin(115200);
     delay(2000);
 
@@ -27,24 +26,21 @@ void setup()
     Serial.println("set subscriber");
 
     // if Artnet packet comes to this universe, this function is called
-    artnet.subscribe(universe, [](uint8_t* data, uint16_t size)
-    {
+    artnet.subscribe(universe, [](const uint8_t* data, const uint16_t size) {
         Serial.print("artnet data (universe : ");
         Serial.print(universe);
         Serial.print(", size = ");
         Serial.print(size);
         Serial.print(") :");
-        for (size_t i = 0; i < size; ++i)
-        {
-            Serial.print(data[i]); Serial.print(",");
+        for (size_t i = 0; i < size; ++i) {
+            Serial.print(data[i]);
+            Serial.print(",");
         }
         Serial.println();
     });
 
-
     // if Artnet packet comes, this function is called to every universe
-    artnet.subscribe([&](uint32_t univ, uint8_t* data, uint16_t size)
-    {
+    artnet.subscribe([&](const uint32_t univ, const uint8_t* data, const uint16_t size) {
         Serial.print("ArtNet data has come to universe: ");
         Serial.println(univ);
     });
@@ -52,13 +48,12 @@ void setup()
     Serial.println("start");
 }
 
-void loop()
-{
-    artnet.parse(); // check if artnet packet has come and execute callback
+void loop() {
+    artnet.parse();  // check if artnet packet has come and execute callback
 
     value = (millis() / 4) % 256;
     memset(data, value, size);
 
     artnet.set(universe, data, size);
-    artnet.streaming(); // automatically send set data in 40fps
+    artnet.streaming();  // automatically send set data in 40fps
 }
diff --git a/examples/Ethernet/sender/sender.ino b/examples/Ethernet/sender/sender.ino
index e64df2d..e7433ee 100644
--- a/examples/Ethernet/sender/sender.ino
+++ b/examples/Ethernet/sender/sender.ino
@@ -12,26 +12,23 @@ const uint16_t size = 512;
 uint8_t data[size];
 uint8_t value = 0;
 
-void setup()
-{
+void setup() {
     Serial.begin(115200);
     delay(2000);
 
     Ethernet.begin(mac, ip);
     artnet.begin(target_ip);
 
-
     Serial.println("start");
     Serial.println(UDP_TX_PACKET_MAX_SIZE);
 }
 
-void loop()
-{
+void loop() {
     value = (millis() / 4) % 256;
     memset(data, value, size);
 
     artnet.set(universe, data, size);
-    artnet.streaming(); // automatically send set data in 40fps
+    artnet.streaming();  // automatically send set data in 40fps
 
     // Serial.println("loop");
 }
diff --git a/examples/WiFi/receiver/receiver.ino b/examples/WiFi/receiver/receiver.ino
index 2c51957..265543c 100644
--- a/examples/WiFi/receiver/receiver.ino
+++ b/examples/WiFi/receiver/receiver.ino
@@ -11,34 +11,35 @@ ArtnetWiFiReceiver artnet;
 uint32_t universe1 = 1;
 uint32_t universe2 = 2;
 
-void callback(uint8_t* data, uint16_t size)
-{
+void callback(const uint8_t* data, const uint16_t size) {
     // you can also use pre-defined callbacks
 }
 
-void setup()
-{
+void setup() {
     Serial.begin(115200);
 
     // WiFi stuff
     WiFi.begin(ssid, pwd);
     WiFi.config(ip, gateway, subnet);
-    while (WiFi.status() != WL_CONNECTED) { Serial.print("."); delay(500); }
-    Serial.print("WiFi connected, IP = "); Serial.println(WiFi.localIP());
+    while (WiFi.status() != WL_CONNECTED) {
+        Serial.print(".");
+        delay(500);
+    }
+    Serial.print("WiFi connected, IP = ");
+    Serial.println(WiFi.localIP());
 
     artnet.begin();
 
     // if Artnet packet comes to this universe, this function (lambda) is called
-    artnet.subscribe(universe1, [&](uint8_t* data, uint16_t size)
-    {
+    artnet.subscribe(universe1, [&](const uint8_t* data, const uint16_t size) {
         Serial.print("lambda : artnet data (universe : ");
         Serial.print(universe1);
         Serial.print(", size = ");
         Serial.print(size);
         Serial.print(") :");
-        for (size_t i = 0; i < size; ++i)
-        {
-            Serial.print(data[i]); Serial.print(",");
+        for (size_t i = 0; i < size; ++i) {
+            Serial.print(data[i]);
+            Serial.print(",");
         }
         Serial.println();
     });
@@ -47,7 +48,6 @@ void setup()
     artnet.subscribe(universe2, callback);
 }
 
-void loop()
-{
-    artnet.parse(); // check if artnet packet has come and execute callback
+void loop() {
+    artnet.parse();  // check if artnet packet has come and execute callback
 }
diff --git a/examples/WiFi/send_receive/send_receive.ino b/examples/WiFi/send_receive/send_receive.ino
index e51e258..3db4183 100644
--- a/examples/WiFi/send_receive/send_receive.ino
+++ b/examples/WiFi/send_receive/send_receive.ino
@@ -15,48 +15,48 @@ const uint16_t size = 512;
 uint8_t data[size];
 uint8_t value = 0;
 
-void setup()
-{
+void setup() {
     Serial.begin(115200);
 
     // WiFi stuff
     WiFi.begin(ssid, pwd);
     WiFi.config(ip, gateway, subnet);
-    while (WiFi.status() != WL_CONNECTED) { Serial.print("."); delay(500); }
-    Serial.print("WiFi connected, IP = "); Serial.println(WiFi.localIP());
+    while (WiFi.status() != WL_CONNECTED) {
+        Serial.print(".");
+        delay(500);
+    }
+    Serial.print("WiFi connected, IP = ");
+    Serial.println(WiFi.localIP());
 
     artnet.begin(target_ip);
 
     // if Artnet packet comes to this universe, this function is called
-    artnet.subscribe(universe, [&](uint8_t* data, uint16_t size)
-    {
+    artnet.subscribe(universe, [&](const uint8_t* data, const uint16_t size) {
         Serial.print("artnet data (universe : ");
         Serial.print(universe);
         Serial.print(", size = ");
         Serial.print(size);
         Serial.print(") :");
-        for (size_t i = 0; i < size; ++i)
-        {
-            Serial.print(data[i]); Serial.print(",");
+        for (size_t i = 0; i < size; ++i) {
+            Serial.print(data[i]);
+            Serial.print(",");
         }
         Serial.println();
     });
 
     // if Artnet packet comes, this function is called to every universe
-    artnet.subscribe([&](uint32_t univ, uint8_t* data, uint16_t size)
-    {
+    artnet.subscribe([&](const uint32_t univ, const uint8_t* data, const uint16_t size) {
         Serial.print("ArtNet data has come to universe: ");
         Serial.println(univ);
     });
 }
 
-void loop()
-{
-    artnet.parse(); // check if artnet packet has come and execute callback
+void loop() {
+    artnet.parse();  // check if artnet packet has come and execute callback
 
     value = (millis() / 4) % 256;
     memset(data, value, size);
 
     artnet.set(universe, data, size);
-    artnet.streaming(); // automatically send set data in 40fps
+    artnet.streaming();  // automatically send set data in 40fps
 }
diff --git a/examples/WiFi/sender/sender.ino b/examples/WiFi/sender/sender.ino
index 32d9d40..9e67261 100644
--- a/examples/WiFi/sender/sender.ino
+++ b/examples/WiFi/sender/sender.ino
@@ -15,24 +15,26 @@ const uint16_t size = 512;
 uint8_t data[size];
 uint8_t value = 0;
 
-void setup()
-{
+void setup() {
     Serial.begin(115200);
 
     // WiFi stuff
     WiFi.begin(ssid, pwd);
     WiFi.config(ip, gateway, subnet);
-    while (WiFi.status() != WL_CONNECTED) { Serial.print("."); delay(500); }
-    Serial.print("WiFi connected, IP = "); Serial.println(WiFi.localIP());
+    while (WiFi.status() != WL_CONNECTED) {
+        Serial.print(".");
+        delay(500);
+    }
+    Serial.print("WiFi connected, IP = ");
+    Serial.println(WiFi.localIP());
 
     artnet.begin(target_ip);
 }
 
-void loop()
-{
+void loop() {
     value = (millis() / 4) % 256;
     memset(data, value, size);
 
     artnet.set(universe, data, size);
-    artnet.streaming(); // automatically send set data in 40fps
+    artnet.streaming();  // automatically send set data in 40fps
 }