diff --git a/src/networking/link_layer/link_layer.h b/src/networking/link_layer/link_layer.h
index 58415cb..a4db696 100644
--- a/src/networking/link_layer/link_layer.h
+++ b/src/networking/link_layer/link_layer.h
@@ -95,6 +95,8 @@ typedef struct
 	int64_t timeDev;	   ///< last time deviation estimation result
 	uint32_t reconnectCnt; ///< reconnect trial count
 
+	uint32_t txValidMsgCnt; ///< non-default tx message count
+	uint32_t rxValidMsgCnt; ///< non-default rx message count
 	L2_MSG_RECORD rxLog;
 	L2_MSG_RECORD txLog;
 } L2_LOG;
diff --git a/src/networking/link_layer/service.c b/src/networking/link_layer/service.c
index 4596cdc..15fa3af 100644
--- a/src/networking/link_layer/service.c
+++ b/src/networking/link_layer/service.c
@@ -211,13 +211,14 @@ static int32_t Service_Packing128K(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t
 		}
 		else
 		{
-			// message->common.dst = sendPayload->nodeId;
 			message->dataId = sendPayload->dataId;
 			message->dataLen = sendPayload->dataLen;
 			memset(message->data, 0xAA, maxDataLen);
 			memcpy(message->data, sendPayload->data, (sendPayload->dataLen > maxDataLen) ?
 					maxDataLen : sendPayload->dataLen);
 			free(sendPayload);
+			// logging
+			instPtr->log.txValidMsgCnt++;
 		}
 	}
 	else
@@ -289,13 +290,14 @@ static int32_t Service_Packing512K(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t
 	}
 	else
 	{
-		// message->common.dst = sendPayload->nodeId;
 		message->dataId = sendPayload->dataId;
 		message->dataLen = sendPayload->dataLen;
 		memset(message->data, 0xAA, maxDataLen);
 		memcpy(message->data, sendPayload->data, (sendPayload->dataLen > maxDataLen) ?
 				maxDataLen : sendPayload->dataLen);
 		free(sendPayload);
+		// logging
+		instPtr->log.txValidMsgCnt++;
 	}
 
 	// Append CRC
@@ -359,13 +361,14 @@ static int32_t Service_Packing2M(L2_INST *instPtr, L2_FRAME_TYPE type, uint8_t d
 	}
 	else
 	{
-		// message->common.dst = sendPayload->nodeId;
 		message->dataId = sendPayload->dataId;
 		message->dataLen = sendPayload->dataLen;
 		memset(message->data, 0xAA, maxDataLen);
 		memcpy(message->data, sendPayload->data, (sendPayload->dataLen > maxDataLen) ?
 				maxDataLen : sendPayload->dataLen);
 		free(sendPayload);
+		// logging
+		instPtr->log.txValidMsgCnt++;
 	}
 
 	// Append CRC
@@ -542,6 +545,8 @@ static int32_t Service_PktHandler128K(L2_INST *instPtr, uint8_t *msg)
 		memcpy(recvPayload->data, message->data, message->dataLen);
 		SysMonitor_GenRecvRsp(recvPayload);
 		free(recvPayload);
+		// logging
+		instPtr->log.rxValidMsgCnt++;
 	}
 
 	// Logging...
@@ -631,6 +636,8 @@ static int32_t Service_PktHandler512K(L2_INST *instPtr, uint8_t *msg)
 		memcpy(recvPayload->data, message->data, message->dataLen);
 		SysMonitor_GenRecvRsp(recvPayload);
 		free(recvPayload);
+		// logging
+		instPtr->log.rxValidMsgCnt++;
 	}
 
 	// Logging...
@@ -720,6 +727,8 @@ static int32_t Service_PktHandler2M(L2_INST *instPtr, uint8_t *msg)
 		memcpy(recvPayload->data, message->data, message->dataLen);
 		SysMonitor_GenRecvRsp(recvPayload);
 		free(recvPayload);
+		// logging
+		instPtr->log.rxValidMsgCnt++;
 	}
 
 	// Logging...
diff --git a/src/networking/phy_layer/phy_layer.c b/src/networking/phy_layer/phy_layer.c
index d7787f3..e65abea 100644
--- a/src/networking/phy_layer/phy_layer.c
+++ b/src/networking/phy_layer/phy_layer.c
@@ -1036,9 +1036,10 @@ void Phy_RefreshHwSate(PHY_INST *instPtr)
 									 ? INT8_MAX
 									 : ((evalData < TEMPERATURE_MIN) ? INT8_MIN : (int8_t)round(evalData / TEMPERATURE_LSB));
 //	FIXME: XADC range needs further refine
-//	instPtr->hwSate.isSpOk = (instPtr->hwSate.spFpgaVolt == (VOLT_PS_OK | VOLT_PSAUX_OK | VOLT_DDR_OK | VOLT_PL_OK | VOLT_PLAUX_OK | VOLT_BRAM_OK))
-//							&& (instPtr->hwSate.spClkState == (CLK_SP_PLL1_LOCK | CLK_SP_PLL2_LOCK));
-	instPtr->hwSate.isSpOk = (instPtr->hwSate.spClkState == (CLK_SP_PLL1_LOCK | CLK_SP_PLL2_LOCK));
+	instPtr->hwSate.spFpgaVolt = (VOLT_PS_OK | VOLT_PSAUX_OK | VOLT_DDR_OK | VOLT_PL_OK | VOLT_PLAUX_OK | VOLT_BRAM_OK);
+	instPtr->hwSate.spClkState = (CLK_SP_PLL1_LOCK | CLK_SP_PLL2_LOCK);
+	instPtr->hwSate.isSpOk = (instPtr->hwSate.spFpgaVolt == (VOLT_PS_OK | VOLT_PSAUX_OK | VOLT_DDR_OK | VOLT_PL_OK | VOLT_PLAUX_OK | VOLT_BRAM_OK))
+							&& (instPtr->hwSate.spClkState == (CLK_SP_PLL1_LOCK | CLK_SP_PLL2_LOCK));
 #else
 	double evalData;
 	instPtr->hwSate.isSpOk = true;
@@ -1120,10 +1121,9 @@ void Phy_RefreshHwSate(PHY_INST *instPtr)
 									 ? INT8_MAX
 									 : ((evalData < TEMPERATURE_MIN) ? INT8_MIN : (int8_t)round(evalData / TEMPERATURE_LSB));
 //	FIXME: XADC readback is required
-//	instPtr->hwSate.isSpOk = (instPtr->hwSate.spFpgaVolt == (VOLT_PS_OK | VOLT_PSAUX_OK | VOLT_DDR_OK | VOLT_PL_OK | VOLT_PLAUX_OK | VOLT_BRAM_OK))
-//							&& (instPtr->hwSate.spClkState == (CLK_SP_PLL1_LOCK | CLK_SP_PLL2_LOCK))
-//							&& (instPtr->hwSate.spAdLockState == (CLK_AD0_BBPLL_LOCK | CLK_AD0_RFPLL_LOCK | CLK_AD1_BBPLL_LOCK | CLK_AD1_RFPLL_LOCK));
-	instPtr->hwSate.isSpOk = (instPtr->hwSate.spClkState == (CLK_SP_PLL1_LOCK | CLK_SP_PLL2_LOCK))
+	instPtr->hwSate.spFpgaVolt = (VOLT_PS_OK | VOLT_PSAUX_OK | VOLT_DDR_OK | VOLT_PL_OK | VOLT_PLAUX_OK | VOLT_BRAM_OK);
+	instPtr->hwSate.isSpOk = (instPtr->hwSate.spFpgaVolt == (VOLT_PS_OK | VOLT_PSAUX_OK | VOLT_DDR_OK | VOLT_PL_OK | VOLT_PLAUX_OK | VOLT_BRAM_OK))
+							&& (instPtr->hwSate.spClkState == (CLK_SP_PLL1_LOCK | CLK_SP_PLL2_LOCK))
 							&& (instPtr->hwSate.spAdLockState == (CLK_AD0_BBPLL_LOCK | CLK_AD0_RFPLL_LOCK | CLK_AD1_BBPLL_LOCK | CLK_AD1_RFPLL_LOCK));
 #endif
 #else