diff --git a/board/TencentOS_tiny_EVB_MX_Plus/KEIL/tcp_through_module/TencentOS_tiny.uvoptx b/board/TencentOS_tiny_EVB_MX_Plus/KEIL/tcp_through_module/TencentOS_tiny.uvoptx
index e7024424..07c4baab 100644
--- a/board/TencentOS_tiny_EVB_MX_Plus/KEIL/tcp_through_module/TencentOS_tiny.uvoptx
+++ b/board/TencentOS_tiny_EVB_MX_Plus/KEIL/tcp_through_module/TencentOS_tiny.uvoptx
@@ -443,7 +443,7 @@
 
   <Group>
     <GroupName>examples</GroupName>
-    <tvExp>0</tvExp>
+    <tvExp>1</tvExp>
     <tvExpOptDlg>0</tvExpOptDlg>
     <cbSel>0</cbSel>
     <RteFlg>0</RteFlg>
diff --git a/board/TencentOS_tiny_EVB_MX_Plus/KEIL/tcp_through_module/TencentOS_tiny.uvprojx b/board/TencentOS_tiny_EVB_MX_Plus/KEIL/tcp_through_module/TencentOS_tiny.uvprojx
index 0dd9dba5..d4c86d18 100644
--- a/board/TencentOS_tiny_EVB_MX_Plus/KEIL/tcp_through_module/TencentOS_tiny.uvprojx
+++ b/board/TencentOS_tiny_EVB_MX_Plus/KEIL/tcp_through_module/TencentOS_tiny.uvprojx
@@ -10,14 +10,14 @@
       <TargetName>TencentOS_tiny</TargetName>
       <ToolsetNumber>0x4</ToolsetNumber>
       <ToolsetName>ARM-ADS</ToolsetName>
-      <pCCUsed>5060750::V5.06 update 6 (build 750)::ARMCC</pCCUsed>
+      <pCCUsed>5060750::V5.06 update 6 (build 750)::.\ARMCC</pCCUsed>
       <uAC6>0</uAC6>
       <TargetOption>
         <TargetCommonOption>
           <Device>STM32L431RCTx</Device>
           <Vendor>STMicroelectronics</Vendor>
-          <PackID>Keil.STM32L4xx_DFP.2.0.0</PackID>
-          <PackURL>http://www.keil.com/pack</PackURL>
+          <PackID>Keil.STM32L4xx_DFP.2.4.0</PackID>
+          <PackURL>http://www.keil.com/pack/</PackURL>
           <Cpu>IRAM(0x20000000-0x2000FFFF) IROM(0x8000000-0x803FFFF) CLOCK(8000000) FPU2 CPUTYPE("Cortex-M4")</Cpu>
           <FlashUtilSpec></FlashUtilSpec>
           <StartupFile></StartupFile>
@@ -185,6 +185,7 @@
             <uocXRam>0</uocXRam>
             <RvdsVP>2</RvdsVP>
             <RvdsMve>0</RvdsMve>
+            <RvdsCdeCp>0</RvdsCdeCp>
             <hadIRAM2>0</hadIRAM2>
             <hadIROM2>0</hadIROM2>
             <StupSel>8</StupSel>
@@ -336,9 +337,9 @@
             <v6Rtti>0</v6Rtti>
             <VariousControls>
               <MiscControls></MiscControls>
-              <Define>USE_HAL_DRIVER,STM32L431xx,WITH_TOS_NET_ADAPTER,USE_ESP8266</Define>
+              <Define>USE_HAL_DRIVER,STM32L431xx,WITH_TOS_NET_ADAPTER</Define>
               <Undefine></Undefine>
-              <IncludePath>..\..\BSP\Inc;..\..\..\..\platform\vendor_bsp\st\STM32L4xx_HAL_Driver\Inc;..\..\..\..\platform\vendor_bsp\st\STM32L4xx_HAL_Driver\Legacy;..\..\..\..\platform\vendor_bsp\st\CMSIS\Device\ST\STM32L4xx\Include;..\..\..\..\platform\vendor_bsp\st\CMSIS\Include;..\..\..\..\kernel\core\include;..\..\TOS-CONFIG;..\..\..\..\platform\arch\arm\cortex-m4\keil;..\..\..\..\kernel\pm\include;..\..\..\..\osal\cmsis_os;..\..\..\..\arch\arm\arm-v7m\common\include;..\..\..\..\arch\arm\arm-v7m\cortex-m4\armcc;..\..\BSP\Hardware\DHT11;..\..\BSP\Hardware\OLED;..\..\BSP\Hardware\BH1750;..\..\..\..\devices\esp8266;..\..\..\..\net\at\include;..\..\..\..\kernel\hal\include;..\..\..\..\net\sal_module_wrapper</IncludePath>
+              <IncludePath>..\..\BSP\Inc;..\..\..\..\platform\vendor_bsp\st\STM32L4xx_HAL_Driver\Inc;..\..\..\..\platform\vendor_bsp\st\STM32L4xx_HAL_Driver\Legacy;..\..\..\..\platform\vendor_bsp\st\CMSIS\Device\ST\STM32L4xx\Include;..\..\..\..\platform\vendor_bsp\st\CMSIS\Include;..\..\..\..\kernel\core\include;..\..\TOS-CONFIG;..\..\..\..\platform\arch\arm\cortex-m4\keil;..\..\..\..\kernel\pm\include;..\..\..\..\osal\cmsis_os;..\..\..\..\arch\arm\arm-v7m\common\include;..\..\..\..\arch\arm\arm-v7m\cortex-m4\armcc;..\..\BSP\Hardware\DHT11;..\..\BSP\Hardware\OLED;..\..\BSP\Hardware\BH1750;..\..\..\..\devices\esp8266;..\..\..\..\net\at\include;..\..\..\..\kernel\hal\include;..\..\..\..\net\sal_module_wrapper;..\..\..\..\devices\ec20</IncludePath>
             </VariousControls>
           </Cads>
           <Aads>
@@ -351,7 +352,7 @@
             <NoWarn>0</NoWarn>
             <uSurpInc>0</uSurpInc>
             <useXO>0</useXO>
-            <uClangAs>0</uClangAs>
+            <ClangAsOpt>4</ClangAsOpt>
             <VariousControls>
               <MiscControls></MiscControls>
               <Define></Define>
@@ -839,4 +840,19 @@
     <files/>
   </RTE>
 
+  <LayerInfo>
+    <Layers>
+      <Layer>
+        <LayName>&lt;Project Info&gt;</LayName>
+        <LayDesc></LayDesc>
+        <LayUrl></LayUrl>
+        <LayKeys></LayKeys>
+        <LayCat></LayCat>
+        <LayLic></LayLic>
+        <LayTarg>0</LayTarg>
+        <LayPrjMark>1</LayPrjMark>
+      </Layer>
+    </Layers>
+  </LayerInfo>
+
 </Project>
diff --git a/examples/tcp_through_module/tcp_through_module.c b/examples/tcp_through_module/tcp_through_module.c
index 646cfcd0..7d15a127 100644
--- a/examples/tcp_through_module/tcp_through_module.c
+++ b/examples/tcp_through_module/tcp_through_module.c
@@ -2,18 +2,27 @@
 #include "sal_module_wrapper.h"
 #include "cmsis_os.h"
 
-//#define USE_ESP8266
-#define USE_SIM800A
-#define USE_BC26
+#define USE_ESP8266
+//#define USE_SIM800A
+//#define USE_BC26
+//#define USE_EC20
 
-#if defined(USE_ESP8266)
+#ifdef USE_ESP8266
 #include "esp8266.h"
-#elif defined(USE_SIM800A)
+#endif
+
+#ifdef USE_SIM800A
 #include "sim800a.h"
-#elif defined(USE_BC26)
+#endif
+
+#ifdef USE_BC26
 #include "bc26.h"
 #endif
 
+#ifdef USE_EC20
+#include "ec20.h"
+#endif
+
 #define TCP_TEST_TASK0_STK_SIZE         4096
 void tcp_test0(void);
 osThreadDef(tcp_test0, osPriorityNormal, 1, TCP_TEST_TASK0_STK_SIZE);
@@ -74,21 +83,19 @@ void tcp_test1(void)
 
 void application_entry(void *arg)
 {
-#ifdef USE_ESP8266
+#if defined(USE_ESP8266)
     esp8266_sal_init(HAL_UART_PORT_0);
     esp8266_join_ap("SheldonDai", "srnr6x9xbhmb0");
-#endif
-
-#ifdef USE_SIM800A
+#elif defined(USE_SIM800A)
     sim800a_power_on();
     sim800a_sal_init(HAL_UART_PORT_2);
+#elif defined(USE_BC26)
+    bc26_sal_init(HAL_UART_PORT_2);
+#elif defined(USE_EC20)
+    ec20_sal_deinit(HAL_PORT_0);
 #endif
     
-#ifdef USE_BC26
-    bc26_sal_init(HAL_UART_PORT_2);
-#endif
-
-    socket_id_0 = tos_sal_module_connect("117.50.111.72", "8080", TOS_SAL_PROTO_TCP);
+    socket_id_0 = tos_sal_module_connect("117.50.111.72", "8080", TOS_SAL_PROTO_TCP); 
     if (socket_id_0 == -1) {
         printf("TCP0 connect failed\r\n");
     } else {