diff --git a/df_datalink_sp/src/networking/link_layer/scan.c b/df_datalink_sp/src/networking/link_layer/scan.c
index 7eac02c..ce8fa7a 100644
--- a/df_datalink_sp/src/networking/link_layer/scan.c
+++ b/df_datalink_sp/src/networking/link_layer/scan.c
@@ -260,14 +260,14 @@ static int32_t Scan_AdvHandler(L2_INST *instPtr)
 		/* if time out reached, go back to init scan stage. */
 		if (scanFsmPtr->advTimeout > ADV_LISTEN_TIMEOUT)
 		{
-			/* Antenna setting (reserved.) */
+			/* Antenna setting (reserved, automatically accomplished by physical layer) */
 			L2_SetupNextSlot(instPtr, L2_TOR_RX, L2_SCAN_FRAME);
 			DBG_WARNING("Adv timeout, restart net scan from L2_SCAN_INIT_STAGE.\n");
 			L2_Scan_Reset(scanFsmPtr);
 		}
 		else
 		{
-			/* Antenna setting (reserved.) */
+			/* Antenna setting (reserved, automatically accomplished by physical layer) */
 			L2_SetupNextSlot(instPtr, L2_TOR_RX, L2_ADV_FRAME);
 			scanFsmPtr->advTimeout++;
 		}
@@ -333,6 +333,7 @@ static int32_t ScanMsg_Packing(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t dst
 		return EPARAM;
 	}
 
+	// Common section of link layer package
 	dataChunk = L2_GetNextFrameNum(instPtr);
 	L2_FrameInsertChunk(buff, L2_MSG_FRAME_NUM, L2_MSG_FRAME_NUM_LEN, &dataChunk);
 	dataChunk = L2_GetNextSlotNum(instPtr);
@@ -419,91 +420,6 @@ static int32_t ScanMsg_Packing(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t dst
 	return SUCCESS;
 }
 
-/*****************************************************************************/
-/**
- * @brief   Initialize scan FSM.
- *
- * @param   instPtr
- *
- * @return
- *
- ******************************************************************************/
-int32_t L2_Scan_Init(L2_SCAN_FSM **scanFSMPtr)
-{
-	ASSERT(scanFSMPtr != NULL);
-	*scanFSMPtr = (L2_SCAN_FSM *)malloc(sizeof(L2_SCAN_FSM));
-	if (*scanFSMPtr == NULL)
-	{
-		DBG_ERROR("Failed to allocate memory for scanFsmPtr.\n");
-		return ENOMEM;
-	}
-	L2_Scan_Reset(*scanFSMPtr);
-	(*scanFSMPtr)->beamNo = 0;
-	(*scanFSMPtr)->tableNo = 0;
-	return SUCCESS;
-}
-
-/*****************************************************************************/
-/**
- * @brief  Reset ScanNet FSM
- *
- * @param   scanFsmPtr a pointer to scan net  finite state machine
- *
- * @return  NONE
- *
- ******************************************************************************/
-void L2_Scan_Reset(L2_SCAN_FSM *scanFSMPtr)
-{
-	ASSERT(scanFSMPtr != NULL);
-	scanFSMPtr->isLocked = false;
-	scanFSMPtr->isAdvRecvd = false;
-	scanFSMPtr->isAckPending = false;
-	scanFSMPtr->scanCnt = 0;
-	scanFSMPtr->advTimeout = 0;
-	scanFSMPtr->cfmTimeout = 0;
-	scanFSMPtr->scanStage = L2_SCAN_NONE_STAGE;
-}
-
-/*****************************************************************************/
-/**
- * @brief  Destroy ScanNet FSM, free memory
- *
- * @param   scanFsmPtr a pointer to scan net  finite state machine
- *
- * @return  NONE
- *
- ******************************************************************************/
-void L2_Scan_Destroy(L2_SCAN_FSM *scanFSMPtr)
-{
-	free(scanFSMPtr);
-}
-
-/*****************************************************************************/
-/**
- * @brief  Refresh scan beam table.
- *
- * @param   instPtr	a pointer to linklayer layer instance
- *
- * @return  NONE
- *
- ******************************************************************************/
-void L2_Scan_RefreashScanTable(L2_INST *instPtr)
-{
-	ASSERT(instPtr != NULL);
-	L2_SCAN_FSM *scanFsmPtr = instPtr->scanFSM;
-	PHY_INST *phyRef = instPtr->config.phyInstPtr;
-	if (scanFsmPtr->tableNo == 0)
-	{
-		Phy_SetBeamTable(phyRef, antNrrwPattern_0, scanFsmPtr->beamNo);
-		scanFsmPtr->tableNo = 1;
-	}
-	else
-	{
-		Phy_SetBeamTable(phyRef, antNrrwPattern_1, scanFsmPtr->beamNo);
-		scanFsmPtr->tableNo = 0;
-	}
-}
-
 /*****************************************************************************/
 /**
  * @brief   Scan net packet handler.
@@ -702,6 +618,90 @@ int32_t L2_Scan_PktHandler(L2_INST *instPtr, uint8_t *msg)
 	return Status;
 }
 
+/*****************************************************************************/
+/**
+ * @brief   Initialize scan FSM.
+ *
+ * @param   instPtr
+ *
+ * @return
+ *
+ ******************************************************************************/
+int32_t L2_Scan_Init(L2_SCAN_FSM **scanFSMPtr)
+{
+	ASSERT(scanFSMPtr != NULL);
+	*scanFSMPtr = (L2_SCAN_FSM *)malloc(sizeof(L2_SCAN_FSM));
+	if (*scanFSMPtr == NULL)
+	{
+		DBG_ERROR("Failed to allocate memory for scanFsmPtr.\n");
+		return ENOMEM;
+	}
+	L2_Scan_Reset(*scanFSMPtr);
+	(*scanFSMPtr)->beamNo = 0;
+	(*scanFSMPtr)->tableNo = 0;
+	return SUCCESS;
+}
+
+/*****************************************************************************/
+/**
+ * @brief  Reset ScanNet FSM
+ *
+ * @param   scanFsmPtr a pointer to scan net  finite state machine
+ *
+ * @return  NONE
+ *
+ ******************************************************************************/
+void L2_Scan_Reset(L2_SCAN_FSM *scanFSMPtr)
+{
+	ASSERT(scanFSMPtr != NULL);
+	scanFSMPtr->isLocked = false;
+	scanFSMPtr->isAdvRecvd = false;
+	scanFSMPtr->isAckPending = false;
+	scanFSMPtr->scanCnt = 0;
+	scanFSMPtr->advTimeout = 0;
+	scanFSMPtr->cfmTimeout = 0;
+	scanFSMPtr->scanStage = L2_SCAN_NONE_STAGE;
+}
+
+/*****************************************************************************/
+/**
+ * @brief  Destroy ScanNet FSM, free memory
+ *
+ * @param   scanFsmPtr a pointer to scan net  finite state machine
+ *
+ * @return  NONE
+ *
+ ******************************************************************************/
+void L2_Scan_Destroy(L2_SCAN_FSM *scanFSMPtr)
+{
+	free(scanFSMPtr);
+}
+
+/*****************************************************************************/
+/**
+ * @brief  Refresh scan beam table.
+ *
+ * @param   instPtr	a pointer to linklayer layer instance
+ *
+ * @return  NONE
+ *
+ ******************************************************************************/
+void L2_Scan_RefreashScanTable(L2_INST *instPtr)
+{
+	ASSERT(instPtr != NULL);
+	L2_SCAN_FSM *scanFsmPtr = instPtr->scanFSM;
+	PHY_INST *phyRef = instPtr->config.phyInstPtr;
+	if (scanFsmPtr->tableNo == 0)
+	{
+		Phy_SetBeamTable(phyRef, antNrrwPattern_0, scanFsmPtr->beamNo);
+		scanFsmPtr->tableNo = 1;
+	}
+	else
+	{
+		Phy_SetBeamTable(phyRef, antNrrwPattern_1, scanFsmPtr->beamNo);
+		scanFsmPtr->tableNo = 0;
+	}
+}
 
 /*****************************************************************************/
 /**
diff --git a/df_datalink_sp/src/networking/link_layer/service.c b/df_datalink_sp/src/networking/link_layer/service.c
index 4d0d63d..b396dda 100644
--- a/df_datalink_sp/src/networking/link_layer/service.c
+++ b/df_datalink_sp/src/networking/link_layer/service.c
@@ -88,6 +88,7 @@ static int32_t Service_Packing(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t dst
 	uint32_t dataChunk;
 	uint8_t *buff = instPtr->sendPktData;
 
+	// Common section of link layer package
 	dataChunk = L2_GetNextFrameNum(instPtr);
 	L2_FrameInsertChunk(buff, L2_MSG_FRAME_NUM, L2_MSG_FRAME_NUM_LEN, &dataChunk);
 	dataChunk = L2_GetNextSlotNum(instPtr);
@@ -113,7 +114,7 @@ static int32_t Service_Packing(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t dst
 		L2_FrameInsertChunk(buff, L2_MSG_SVC_SRC_SPEEDZ, L2_MSG_SVC_SRC_SPEEDZ_LEN, &(instPtr->sysInfo.vZ));
 
 		uint32_t dataId;
-		if(L2_GetNodeType(instPtr) == L2_NODE_HEAD)
+		if (L2_GetNodeType(instPtr) == L2_NODE_HEAD)
 		{
 			SysMonitor_GetSendPayload(buff + L2_MSG_SVC_PAYLOAD, &dataId, PAYLOAD_LEN_FLJ_TX);
 		}
@@ -128,12 +129,6 @@ static int32_t Service_Packing(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t dst
 			L2_FrameInsertChunk(buff, L2_MSG_SVC_PAYLOAD, L2_MSG_SVC_PAYLOAD_LEN, testData);
 		}
 
-		// // packing payload
-		// uint32_t dataId;
-		// dataId = DATA_ID_TEST;
-		// L2_FrameInsertChunk(buff, L2_MSG_SVC_PAYLOAD_ID, L2_MSG_SVC_PAYLOAD_ID_LEN, &dataId);
-		// L2_FrameInsertChunk(buff, L2_MSG_SVC_PAYLOAD, L2_MSG_SVC_PAYLOAD_LEN, testData);
-
 		Status = L2_CrcAppend(buff, L2_SVC_PACK_LEN - L2_MSG_SVC_CRC_LEN, L2_MSG_SVC_CRC, L2_CRC16_1021);
 		if (Status != SUCCESS)
 		{
@@ -159,62 +154,6 @@ static int32_t Service_Packing(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t dst
 #endif
 }
 
-/*****************************************************************************/
-/**
- * @brief   Initialize service net FSM
- *
- * @param   serviceFSM  A pointer to service FSM instance.
- *
- * @return  SUCCESS Initialize successfully.
- *          Other       Initialize failed.
- *
- ******************************************************************************/
-int32_t L2_Service_Init(L2_SVC_FSM **svcFSMPtr)
-{
-	ASSERT(svcFSMPtr != NULL);
-	*svcFSMPtr = (L2_SVC_FSM *)malloc(sizeof(L2_SVC_FSM));
-	if (*svcFSMPtr == NULL)
-	{
-		return ENOMEM;
-	}
-	L2_Service_Reset(*svcFSMPtr);
-	return SUCCESS;
-}
-
-/*****************************************************************************/
-/**
- * @brief  Reset ServiceNet FSM
- *
- * @param   scanFsmPtr a pointer to service net finite state machine
- *
- * @return  NONE
- *
- ******************************************************************************/
-void L2_Service_Reset(L2_SVC_FSM *svcFSMPtr)
-{
-	ASSERT(svcFSMPtr != NULL);
-	memset((&svcFSMPtr->rxLog), 0x00, sizeof(PAYLOAD));
-	memset((&svcFSMPtr->txLog), 0x00, sizeof(PAYLOAD));
-#ifdef DATALINK_ENABLE_BERTEST
-	svcFSMPtr->bitTotal = 0;
-	svcFSMPtr->bitError = 0;
-#endif
-}
-
-/*****************************************************************************/
-/**
- * @brief  Destroy ServiceNet FSM, free memory
- *
- * @param   scanFsmPtr a pointer to service net finite state machine
- *
- * @return  NONE
- *
- ******************************************************************************/
-void L2_Service_Destroy(L2_SVC_FSM *serviceFSM)
-{
-	free(serviceFSM);
-}
-
 /*****************************************************************************/
 /**
  * @brief   Handle service received packet. Send data up to MPC
@@ -244,7 +183,7 @@ int32_t L2_Service_PktHandler(L2_INST *instPtr, uint8_t *msg)
 		if (node == NULL)
 		{
 			node = L2_AppendNode(instPtr->nodeList, nodeId, L2_NODE_MEMBER);
-			if(node == NULL)
+			if (node == NULL)
 			{
 				DBG_ERROR("Failed to append new node [id: %" PRIu8 "]", nodeId);
 				Status = ENOMEM;
@@ -255,18 +194,18 @@ int32_t L2_Service_PktHandler(L2_INST *instPtr, uint8_t *msg)
 		// Update node info.
 		float nodePos;
 		L2_FrameGetChunk(msg, L2_MSG_SVC_SRC_POSX, L2_MSG_SVC_SRC_POSX_LEN, &nodePos);
-		node->nodeInfo.pos.x = (double) nodePos;
+		node->nodeInfo.pos.x = (double)nodePos;
 		L2_FrameGetChunk(msg, L2_MSG_SVC_SRC_POSY, L2_MSG_SVC_SRC_POSY_LEN, &nodePos);
-		node->nodeInfo.pos.y = (double) nodePos;
+		node->nodeInfo.pos.y = (double)nodePos;
 		L2_FrameGetChunk(msg, L2_MSG_SVC_SRC_POSZ, L2_MSG_SVC_SRC_POSZ_LEN, &nodePos);
-		node->nodeInfo.pos.z = (double) nodePos;
+		node->nodeInfo.pos.z = (double)nodePos;
 		float nodeSpeed;
 		L2_FrameGetChunk(msg, L2_MSG_SVC_SRC_SPEEDX, L2_MSG_SVC_SRC_SPEEDX_LEN, &nodeSpeed);
-		node->nodeInfo.speed.x = (double) nodePos;
+		node->nodeInfo.speed.x = (double)nodePos;
 		L2_FrameGetChunk(msg, L2_MSG_SVC_SRC_SPEEDY, L2_MSG_SVC_SRC_SPEEDY_LEN, &nodeSpeed);
-		node->nodeInfo.speed.y = (double) nodePos;
+		node->nodeInfo.speed.y = (double)nodePos;
 		L2_FrameGetChunk(msg, L2_MSG_SVC_SRC_SPEEDZ, L2_MSG_SVC_SRC_SPEEDZ_LEN, &nodeSpeed);
-		node->nodeInfo.speed.z = (double) nodePos;
+		node->nodeInfo.speed.z = (double)nodePos;
 
 		// Reset node ttl
 		node->ttlCnt = 0;
@@ -344,6 +283,65 @@ int32_t L2_Service_PktHandler(L2_INST *instPtr, uint8_t *msg)
 #endif
 }
 
+/*****************************************************************************/
+/**
+ * @brief   Initialize service net FSM
+ *
+ * @param   serviceFSM  A pointer to service FSM instance.
+ *
+ * @return  SUCCESS Initialize successfully.
+ *          Other       Initialize failed.
+ *
+ ******************************************************************************/
+int32_t L2_Service_Init(L2_SVC_FSM **svcFSMPtr)
+{
+	ASSERT(svcFSMPtr != NULL);
+	*svcFSMPtr = (L2_SVC_FSM *)malloc(sizeof(L2_SVC_FSM));
+	if (*svcFSMPtr == NULL)
+	{
+		return ENOMEM;
+	}
+	L2_Service_Reset(*svcFSMPtr);
+	return SUCCESS;
+}
+
+/*****************************************************************************/
+/**
+ * @brief  Reset ServiceNet FSM
+ *
+ * @param   scanFsmPtr a pointer to service net finite state machine
+ *
+ * @return  NONE
+ *
+ ******************************************************************************/
+void L2_Service_Reset(L2_SVC_FSM *svcFSMPtr)
+{
+	ASSERT(svcFSMPtr != NULL);
+	svcFSMPtr->txCnt = 0;
+	svcFSMPtr->rxCnt = 0;
+	svcFSMPtr->rxdCnt = 0;
+#ifdef DATALINK_ENABLE_BERTEST
+	svcFSMPtr->bitTotal = 0;
+	svcFSMPtr->bitError = 0;
+	svcFSMPtr->lossRate = 0;
+	svcFSMPtr->errorRate = 0;
+#endif
+}
+
+/*****************************************************************************/
+/**
+ * @brief  Destroy ServiceNet FSM, free memory
+ *
+ * @param   scanFsmPtr a pointer to service net finite state machine
+ *
+ * @return  NONE
+ *
+ ******************************************************************************/
+void L2_Service_Destroy(L2_SVC_FSM *serviceFSM)
+{
+	free(serviceFSM);
+}
+
 /*****************************************************************************/
 /**
  * @brief   Service FSM Routine.
@@ -364,9 +362,10 @@ int32_t L2_Service_Routine(L2_INST *instPtr, const L2_RTNE_TABLE_ENTRY *rtneEntr
 		return SUCCESS; // skip
 	}
 
-	PHY_INST* phyRef = instPtr->config.phyInstPtr;
+	PHY_INST *phyRef = instPtr->config.phyInstPtr;
+	L2_SVC_FSM *svcFSMPtr = instPtr->serviceFSM;
 	L2_TOR_TYPE torState;
-	const NODE_ENTRY* commNode;
+	const NODE_ENTRY *commNode;
 	if (rtneEntry->src == L2_GetNodeId(instPtr))
 	{
 		torState = L2_TOR_TX;