diff --git a/examples/README.md b/examples/README.md
index b622665..72f7f7b 100644
--- a/examples/README.md
+++ b/examples/README.md
@@ -13,12 +13,12 @@
 
 ### Inbox
 
-| key     | description                                                        | values                     |
-|---------|--------------------------------------------------------------------|----------------------------|
-| sleep   | Start sleep cycles lasting `value` seconds each                    | 0 (stop sleeping), 1-13612 |
-| battery | Ask for battery value                                              |                            |
-| ota     | `pio run -t upload --upload-port 192.168.4.1` when connected to AP |                            |
-| skills  | Get a list of actions the Brick responds to                        |                            |
+| key        | description                                                        | values                     |
+|------------|--------------------------------------------------------------------|----------------------------|
+| setSleep   | Start sleep cycles lasting `value` seconds each                    | 0 (stop sleeping), 1-13612 |
+| setOta     | `pio run -t upload --upload-port 192.168.4.1` when connected to AP |                            |
+| getBattery | Ask for battery value                                              |                            |
+| getSkills  | Get a list of actions the Brick responds to                        |                            |
 
 ### Outbox
 
diff --git a/examples/ble/src/main.cpp b/examples/ble/src/main.cpp
index 8864e39..d8809d1 100644
--- a/examples/ble/src/main.cpp
+++ b/examples/ble/src/main.cpp
@@ -28,13 +28,13 @@ void scan(const uint8_t scanTime, const bool activeScan = false) {
   Log.notice("BLES: Scan done" CR);
 }
 
-void passiveScan(const uint8_t *macAddr, const Message message) {
+void passiveScan(BRICKS_CALLBACK_SIGNATURE) {
   const uint8_t scanTime = atoi(message.value);
   scan(scanTime, false);
 }
 
 // active scan required to get names?
-void activeScan(const uint8_t *macAddr, const Message message) {
+void activeScan(BRICKS_CALLBACK_SIGNATURE) {
   const uint8_t scanTime = atoi(message.value);
   scan(scanTime, true);
 }
diff --git a/examples/buzzer/src/main.cpp b/examples/buzzer/src/main.cpp
index be1442d..a666751 100644
--- a/examples/buzzer/src/main.cpp
+++ b/examples/buzzer/src/main.cpp
@@ -7,7 +7,7 @@ using namespace Bricks;
 const int BUZZER = D5;
 
 // Bricks callbacks
-void playTone(const uint8_t *macAddr, const Message message) {
+void playTone(BRICKS_CALLBACK_SIGNATURE) {
   int frequency;
   int duration;
   sscanf(message.value, "%d,%d", &frequency, &duration);
diff --git a/examples/ir/src/main.cpp b/examples/ir/src/main.cpp
index 99dee29..773873b 100644
--- a/examples/ir/src/main.cpp
+++ b/examples/ir/src/main.cpp
@@ -24,7 +24,7 @@ decode_results results;
 IRCode *code;
 
 // Bricks callbacks
-void sendCode(const uint8_t *macAddr, const Message message) {
+void sendCode(BRICKS_CALLBACK_SIGNATURE) {
   code = codes[atoi(message.value)];
 }
 
diff --git a/examples/led-matrix/src/main.cpp b/examples/led-matrix/src/main.cpp
index f4f2dae..3036d31 100644
--- a/examples/led-matrix/src/main.cpp
+++ b/examples/led-matrix/src/main.cpp
@@ -9,7 +9,7 @@ using namespace Bricks;
 MLED matrix(7);
 
 // Bricks callbacks
-void setValue(const uint8_t *macAddr, const Message message) {
+void setValue(BRICKS_CALLBACK_SIGNATURE) {
   matrix.clear();
   matrix.setCursor(2, 1);
   matrix.print(message.value);
diff --git a/examples/led-rgb/src/main.cpp b/examples/led-rgb/src/main.cpp
index e679f23..67a89bd 100644
--- a/examples/led-rgb/src/main.cpp
+++ b/examples/led-rgb/src/main.cpp
@@ -10,15 +10,15 @@ using namespace Bricks;
 Lumi::Animator animator;
 
 // Bricks callbacks
-void setPattern(const uint8_t *macAddr, const Message message) {
+void setPattern(BRICKS_CALLBACK_SIGNATURE) {
   animator.currentPattern = atoi(message.value);
 }
 
-void setVariation(const uint8_t *macAddr, const Message message) {
+void setVariation(BRICKS_CALLBACK_SIGNATURE) {
   animator.currentVariation = atoi(message.value);
 }
 
-void setDelay(const uint8_t *macAddr, const Message message) {
+void setDelay(BRICKS_CALLBACK_SIGNATURE) {
   animator.currentDelay = atoi(message.value);
 }
 
diff --git a/examples/led/src/main.cpp b/examples/led/src/main.cpp
index ea41e37..3c46c6e 100644
--- a/examples/led/src/main.cpp
+++ b/examples/led/src/main.cpp
@@ -5,7 +5,7 @@ using namespace Bricks;
 
 const int ledPin = LED_BUILTIN;
 
-void setPattern(const uint8_t *macAddr, const Message message) {
+void setPattern(BRICKS_CALLBACK_SIGNATURE) {
   if(atoi(message.value)) {
     digitalWrite(ledPin, LOW);
   }
diff --git a/src/Bricks.BatterySkill.cpp b/src/Bricks.BatterySkill.cpp
index 775ccf4..025cb7f 100644
--- a/src/Bricks.BatterySkill.cpp
+++ b/src/Bricks.BatterySkill.cpp
@@ -1,7 +1,7 @@
 #include <Bricks.BatterySkill.h>
 
 namespace Bricks {
-  BatterySkill::BatterySkill(const uint8_t pin) : Skill("battery") {
+  BatterySkill::BatterySkill(const uint8_t pin) : Skill("getBattery") {
     this->pin = pin;
   }
 
diff --git a/src/Bricks.ListSkill.cpp b/src/Bricks.ListSkill.cpp
index 623581d..f55e4f0 100644
--- a/src/Bricks.ListSkill.cpp
+++ b/src/Bricks.ListSkill.cpp
@@ -1,7 +1,7 @@
 #include "Bricks.ListSkill.h"
 
 namespace Bricks {
-  ListSkill::ListSkill() : Skill("skills") {
+  ListSkill::ListSkill() : Skill("getSkills") {
   }
 
   void ListSkill::callback(BRICKS_CALLBACK_SIGNATURE) {
diff --git a/src/Bricks.OtaSkill.cpp b/src/Bricks.OtaSkill.cpp
index 9e06a0e..cb636ad 100644
--- a/src/Bricks.OtaSkill.cpp
+++ b/src/Bricks.OtaSkill.cpp
@@ -1,7 +1,7 @@
 #include "Bricks.OtaSkill.h"
 
 namespace Bricks {
-  OtaSkill::OtaSkill() : Skill("ota") {
+  OtaSkill::OtaSkill() : Skill("setOta") {
   }
 
   void OtaSkill::loop() {
diff --git a/src/Bricks.PublishSkill.cpp b/src/Bricks.PublishSkill.cpp
index 1ff8a9d..cb58962 100644
--- a/src/Bricks.PublishSkill.cpp
+++ b/src/Bricks.PublishSkill.cpp
@@ -1,7 +1,7 @@
 #include "Bricks.PublishSkill.h"
 
 namespace Bricks {
-  PublishSkill::PublishSkill() : Skill("*") {
+  PublishSkill::PublishSkill() : Skill("*", nullptr, false) {
     gEvents.publish(BRICKS_MESSAGES_IN "/gateway/awake");
   }
 
diff --git a/src/Bricks.Skill.cpp b/src/Bricks.Skill.cpp
index a4550d7..36556f9 100644
--- a/src/Bricks.Skill.cpp
+++ b/src/Bricks.Skill.cpp
@@ -1,9 +1,10 @@
 #include <Bricks.Skill.h>
 
 namespace Bricks {
-  Skill::Skill(const char *key, std::function<void(const uint8_t *macAddr, const Message message)> customCallback) {
+  Skill::Skill(const char *key, std::function<void(BRICKS_CALLBACK_SIGNATURE)> customCallback, bool sendAck) {
     this->key = key;
     this->customCallback = customCallback;
+    this->sendAck = sendAck;
   }
 
   bool Skill::respondsTo(const char *compareKey) {
@@ -12,16 +13,16 @@ namespace Bricks {
 
   void Skill::process(const uint8_t *macAddr, const Message message) {
     char response[100];
+    strcpy(response, message.value);
     callback(macAddr, message, response);
 
-    // Doesn't work yet. Always true.
-    if(response) {
+    if(sendAck) {
       ack(response);
     }
   }
 
   void Skill::callback(BRICKS_CALLBACK_SIGNATURE) {
-    customCallback(macAddr, message);
+    customCallback(macAddr, message, response);
   }
 
   void Skill::loop() {
diff --git a/src/Bricks.Skill.h b/src/Bricks.Skill.h
index af2ba32..d1b496b 100644
--- a/src/Bricks.Skill.h
+++ b/src/Bricks.Skill.h
@@ -14,7 +14,7 @@ namespace Bricks {
     const char *ACK_PREFIX = "ack";
 
     public:
-      Skill(const char *key = "", std::function<void(const uint8_t *macAddr, const Message message)> customCallback = nullptr);
+      Skill(const char *key = "", std::function<void(BRICKS_CALLBACK_SIGNATURE)> customCallback = nullptr, bool sendAck = true);
       bool respondsTo(const char* compareKey);
       void process(const uint8_t *macAddr, const Message message);
       virtual void callback(BRICKS_CALLBACK_SIGNATURE);
@@ -22,7 +22,8 @@ namespace Bricks {
       const char *key;
     private:
       void ack(const char *response);
-      std::function<void(const uint8_t *macAddr, const Message message)> customCallback;
+      bool sendAck;
+      std::function<void(BRICKS_CALLBACK_SIGNATURE)> customCallback;
   };
 }
 #endif
diff --git a/src/Bricks.SleepSkill.cpp b/src/Bricks.SleepSkill.cpp
index afc0c56..58d669b 100644
--- a/src/Bricks.SleepSkill.cpp
+++ b/src/Bricks.SleepSkill.cpp
@@ -5,7 +5,7 @@ namespace Bricks {
   RTC_DATA_ATTR uint32_t rtcSleepTime = 0;
 #endif
 
-  SleepSkill::SleepSkill(const char *name) : Skill("sleep") {
+  SleepSkill::SleepSkill(const char *name) : Skill("setSleep") {
     this->name = name;
     sendAwakeMessage();
 
diff --git a/test/inbox/test_inbox.cpp b/test/inbox/test_inbox.cpp
index 4080972..0df7874 100644
--- a/test/inbox/test_inbox.cpp
+++ b/test/inbox/test_inbox.cpp
@@ -13,7 +13,7 @@ void setUp(void) {
 void test_battery() {
   const uint8_t macAddr[] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
   Message message;
-  strcpy(message.key, "battery");
+  strcpy(message.key, "getBattery");
 
   gInbox.skills[0] = new BatterySkill();
   gInbox.process(macAddr, message);
@@ -22,7 +22,7 @@ void test_battery() {
 void test_list_skills() {
   gInbox.skills[0] = new BatterySkill();
 
-  TEST_ASSERT_EQUAL_STRING("battery", gInbox.listSkills().c_str());
+  TEST_ASSERT_EQUAL_STRING("getBattery", gInbox.listSkills().c_str());
 }
 
 void setup() {