diff --git a/CanSpamTransmitter.c b/CanSpamTransmitter.c
index 0c66f1f..9b5d922 100644
--- a/CanSpamTransmitter.c
+++ b/CanSpamTransmitter.c
@@ -100,6 +100,24 @@ static eTimeEventTransmit isEventTransmitter(tCanSpamTransmitter *env) {
     if (env->time_CCU_HVC_Req_Msg < env->timeMs) {
         env->time_CCU_HVC_Req_Msg = env->timeMs + CCU_HVC_Req_Msg_CYC;
 
+        // Rolling Counter [0 - 15]
+        if (ccu_candb_tx.CCU_HVC_Req_Msg.CCU_HVC_Req_RC > 15) {
+            ccu_candb_tx.CCU_HVC_Req_Msg.CCU_HVC_Req_RC = 0;
+        } else {
+            ++ccu_candb_tx.CCU_HVC_Req_Msg.CCU_HVC_Req_RC;
+        }
+
+        // Checksum XOR8 of the data field this message
+        // Checksum computed as per XOR algorithm:
+        // Byte 1 XOR byte 2 .... XOR byte n-1. (n = packet length.)
+
+        uint8_t d0 = (uint8_t) ((ccu_candb_tx.CCU_HVC_Req_Msg.CCU_eCompSpeedReq_Val_ro & (0xFFU)));
+        uint8_t d1 = (uint8_t) ((ccu_candb_tx.CCU_HVC_Req_Msg.CCU_eCompReq_Stat & (0x01U)) |
+                                ((ccu_candb_tx.CCU_HVC_Req_Msg.CCU_LowTempValve_Req & (0x03U)) << 1U) |
+                                ((ccu_candb_tx.CCU_HVC_Req_Msg.CCU_HVC_Req_RC & (0x0FU)) << 4U));
+
+        ccu_candb_tx.CCU_HVC_Req_Msg.CCU_HVC_Req_CS = d0 ^ d1;
+
         env->can_id = Pack_CCU_HVC_Req_Msg_candb(&ccu_candb_tx.CCU_HVC_Req_Msg, env->canFrame.data, &env->canFrame.dlc,
                                                  &env->ide);
 
@@ -151,6 +169,33 @@ static eTimeEventTransmit isEventTransmitter(tCanSpamTransmitter *env) {
     if (env->time_CCU_Msg1 < env->timeMs) {
         env->time_CCU_Msg1 = env->timeMs + CCU_Msg1_CYC;
 
+        // Rolling Counter [0 - 15]
+        if (ccu_candb_tx.CCU_Msg1.CCU_MSG1_RC > 15) {
+            ccu_candb_tx.CCU_Msg1.CCU_MSG1_RC = 0;
+        } else {
+            ++ccu_candb_tx.CCU_Msg1.CCU_MSG1_RC;
+        }
+
+        // Checksum XOR8 of the data field this message
+        // Checksum computed as per XOR algorithm:
+        // Byte 1 XOR byte 2 .... XOR byte n-1. (n = packet length.)
+        uint8_t d0 = (uint8_t) ((ccu_candb_tx.CCU_Msg1.CCU_MirrorHeating_Req & (0x03U)) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_RecirculationLed_Cmd & (0x01U)) << 2U) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_DefrostLed_Req & (0x01U)) << 3U) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_SideWindowHeating_Req & (0x03U)) << 4U) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_RearWindowHeating_Req & (0x03U)) << 6U));
+        uint8_t d1 = (uint8_t) ((ccu_candb_tx.CCU_Msg1.CCU_FrontWindowHeating_Req & (0x03U)) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_EmergAirCleaning_Stat & (0x01U)) << 2U) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_FireExtinguishSys_Stat & (0x01U)) << 3U));
+        uint8_t d3 = (uint8_t) ((ccu_candb_tx.CCU_Msg1.CCU_FLAutoPsngrLed_Cmd & (0x01U)) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_FRAutoPsngrLed_Cmd & (0x01U)) << 1U) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_RLAutoPsngrLed_Cmd & (0x01U)) << 2U) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_RRAutoPsngrLed_Cmd & (0x01U)) << 3U) |
+                                ((ccu_candb_tx.CCU_Msg1.CCU_AC_MaxLed_Cmd & (0x01U)) << 4U));
+        uint8_t d6 = (uint8_t) (((ccu_candb_tx.CCU_Msg1.CCU_MSG1_RC & (0x0FU)) << 4U));
+
+        ccu_candb_tx.CCU_Msg1.CCU_MSG1_CS = d0 ^ d1 ^ d3 ^ d6;
+
         env->can_id = Pack_CCU_Msg1_candb(&ccu_candb_tx.CCU_Msg1, env->canFrame.data, &env->canFrame.dlc, &env->ide);
 
         return event_CCU_Msg1;
@@ -167,6 +212,25 @@ static eTimeEventTransmit isEventTransmitter(tCanSpamTransmitter *env) {
     if (env->time_CCU_Msg3 < env->timeMs) {
         env->time_CCU_Msg3 = env->timeMs + CCU_Msg3_CYC;
 
+        // Rolling Counter [0 - 15]
+        if (ccu_candb_tx.CCU_Msg3.CCU_MSG3_RC > 15) {
+            ccu_candb_tx.CCU_Msg3.CCU_MSG3_RC = 0;
+        } else {
+            ++ccu_candb_tx.CCU_Msg3.CCU_MSG3_RC;
+        }
+
+        // Checksum XOR8 of the data field this message
+        // Checksum computed as per XOR algorithm:
+        // Byte 1 XOR byte 2 .... XOR byte n-1. (n = packet length.)
+
+        uint8_t d0 = (uint8_t) ((ccu_candb_tx.CCU_Msg3.CCU_FAN_Req & (0x7FU)));
+        uint8_t d1 = (uint8_t) ((ccu_candb_tx.CCU_Msg3.CCU_RestMode_Stat & (0x03U)));
+        uint8_t d2 = (uint8_t) ((ccu_candb_tx.CCU_Msg3.CCU_IncarTempSum_Val_ro & (0xFFU)));
+        uint8_t d3 = (uint8_t) ((ccu_candb_tx.CCU_Msg3.CCU_MSG3_RC & (0x0FU)));
+
+        ccu_candb_tx.CCU_Msg3.CCU_MSG3_CS = d0 ^ d1 ^ d2 ^ d3;
+
+
         env->can_id = Pack_CCU_Msg3_candb(&ccu_candb_tx.CCU_Msg3, env->canFrame.data, &env->canFrame.dlc, &env->ide);
 
         return event_CCU_Msg3;
diff --git a/CanSpamTransmitter.h b/CanSpamTransmitter.h
index d7a31c9..ad3247a 100644
--- a/CanSpamTransmitter.h
+++ b/CanSpamTransmitter.h
@@ -14,13 +14,14 @@
 #define CCU_Stat2_SEND 1
 #define CCU_Stat3_SEND 1
 #define CCU_Errors_SEND 1
-#define CCU_Requests_SEND 0
-#define CCU_HVC_Req_Msg_SEND 0
-#define CCU_VCU_Msg1_SEND 0
-#define CCU_VCU_Msg2_SEND 0
-#define CCU_Msg1_SEND 0
-#define CCU_Msg3_SEND 0
-#define CU_AC_Ctrl_SEND 0
+
+#define CCU_Requests_SEND 1
+#define CCU_HVC_Req_Msg_SEND 1
+#define CCU_VCU_Msg1_SEND 1
+#define CCU_VCU_Msg2_SEND 1
+#define CCU_Msg1_SEND 1
+#define CCU_Msg3_SEND 1
+#define CU_AC_Ctrl_SEND 1
 
 
 typedef enum {