diff --git a/examples/arduino/EspLinkSample/EspLink.cpp b/examples/arduino/EspLinkSample/EspLink.cpp
index 7b1a21d..0e2972a 100644
--- a/examples/arduino/EspLinkSample/EspLink.cpp
+++ b/examples/arduino/EspLinkSample/EspLink.cpp
@@ -71,7 +71,7 @@ void EspLink::sendPacketArg(uint16_t len, uint8_t * data)
   writeBuf((uint8_t*)&len, 2);
   writeBuf(data, len);
 
-  uint16_t pad = (4-((len+2)&3))&3; // get to multiple of 4
+  uint16_t pad = ((len+3)&~3) - len; // get to multiple of 4
   if (pad > 0) {
     uint32_t temp = 0;
     writeBuf((uint8_t*)&temp, pad);
diff --git a/examples/arduino/EspLinkSample/EspLinkSample.ino b/examples/arduino/EspLinkSample/EspLinkSample.ino
index b1b199f..81d721c 100644
--- a/examples/arduino/EspLinkSample/EspLinkSample.ino
+++ b/examples/arduino/EspLinkSample/EspLinkSample.ino
@@ -52,6 +52,14 @@ void packetReceived(CmdRequest *req)
       }
       break;
   }
+
+  char * json = "{'last_name': 'helloka'}";
+
+  espLink.sendPacketStart(CMD_WEB_JSON_DATA, 100, 3);
+  espLink.sendPacketArg(4, ip);
+  espLink.sendPacketArg(2, (uint8_t *)&port);
+  espLink.sendPacketArg(strlen(json), (uint8_t *)json);
+  espLink.sendPacketEnd();
   
 }
 
diff --git a/web-server/web-server.c b/web-server/web-server.c
index 67b1fd8..5ce1de8 100644
--- a/web-server/web-server.c
+++ b/web-server/web-server.c
@@ -177,10 +177,33 @@ int ICACHE_FLASH_ATTR WEB_CgiJsonHook(HttpdConnData *connData)
 		connData->cgiData = (void *)1;
 	}
 	
-	// TODO
 	return HTTPD_CGI_MORE;
 }
 
 void ICACHE_FLASH_ATTR WEB_JsonData(CmdPacket *cmd)
 {
-}
\ No newline at end of file
+	CmdRequest req;
+	cmdRequest(&req, cmd);
+	
+	os_printf("JSON data\n"); // TODO
+	
+	if (cmdGetArgc(&req) != 3) return;
+	
+	uint8_t ip[4];
+	cmdPopArg(&req, ip, 4);
+	os_printf("IP:%d.%d.%d.%d\n", ip[0], ip[1], ip[2], ip[3]); // TODO
+	
+	uint16_t port;
+	cmdPopArg(&req, &port, 2);
+	os_printf("Port:%d\n", port); // TODO
+	
+	int16_t len = cmdArgLen(&req);
+	os_printf("Len:%d\n", len); // TODO
+	uint8_t json[len+1];
+	json[len] = 0;
+	cmdPopArg(&req, json, len);
+	
+	os_printf("%s\n", json); // TODO
+	
+	// TODO
+}