Added ESP8266

It is now possible to use a esp8266-chip to request modbus via tcp, no example provided, similar to other examples

Author: flouk19

ModbusTCP.cpp

@@ -24,6 +24,7 @@ Arduino library for communicating with Modbus server over Ethernet in TCP.
   
   Adopted from ModbusMaster for RTU over RS-485 by Doc Walker
   Modified by Narendra Dehury for TCP.
+  Modified by Florian K for ESP8266.
   copyright @ phoenixrobotix.com
   
 */
@@ -583,6 +584,8 @@ uint8_t ModbusTCP::ModbusMasterTransaction(uint8_t u8MBFunction)
   if(!ModbusClient.connected()) {         // fOR w5100
 #elif ENC28J60
   if(!MBconnectionFlag) {                 // For ENC28J60
+#elif ESP8266
+  if (!ModbusClient.connected()) {        // for esp8266
 #endif
     Serial.print(F("Trying to connect..."));
     MBconnectionFlag = 0;
@@ -602,9 +605,11 @@ uint8_t ModbusTCP::ModbusMasterTransaction(uint8_t u8MBFunction)
   else
     Serial.println(F("Already Connected to Server!!"));
 
-
+#ifdef ESP8266
+  ModbusClient.write(&u8ModbusADU[0], u8ModbusADUSize);
+#else
   ModbusClient.write(u8ModbusADU, u8ModbusADUSize);
-  
+#endif
   u8ModbusADUSize = 0;
   // loop until we run out of time or bytes, or an error occurs
   u32StartTime = millis();
@@ -659,8 +664,11 @@ uint8_t ModbusTCP::ModbusMasterTransaction(uint8_t u8MBFunction)
 #if WIZNET_W5100  
   ModbusClient.stop();
   Serial.println("WIZNET W5100 : Stopping");
-#else
+#elif ENC28J60
   Serial.println("ENC28J60 : Not Stopping");
+#elif ESP8266
+  ModbusClient.stop();
+  Serial.println("ESP8266 : Stopping");
 #endif
 
 

ModbusTCP.h

@@ -33,6 +33,8 @@ Arduino library for communicating with Modbus server over Ethernet in TCP.
   Adopted from ModbusMaster for RTU over RS-485 by Doc Walker
   
   Modified by Narendra Dehury for TCP.
+
+  Modified by Florian K for ESP8266.
   
   Copyright @ phoenixrobotix.com
   
@@ -43,8 +45,8 @@ Arduino library for communicating with Modbus server over Ethernet in TCP.
 #define Modbus_TCPIP_h
 
 #define WIZNET_W5100  0       /**< define 1 if  WIZNET W5100 IC is used, otherwise 0 */
-#define ENC28J60      1       /**< define 1 if  ENC28J60 IC is used, otherwisw 0     */
-
+#define ENC28J60      0       /**< define 1 if  ENC28J60 IC is used, otherwise 0     */
+#define ESP8266       1
 
 
 /* _____STANDARD INCLUDES____________________________________________________ */
@@ -65,6 +67,10 @@ Arduino library for communicating with Modbus server over Ethernet in TCP.
 #include <UIPEthernet.h>
 #endif
 
+#if ESP8266
+#include <WiFiClient.h>
+#endif
+
 
 /* _____PROJECT INCLUDES_____________________________________________________ */
 
@@ -86,6 +92,8 @@ class ModbusTCP
     EthernetClient ModbusClient;
 #elif ENC28J60
     UIPClient ModbusClient;
+#elif ESP8266
+    WiFiClient ModbusClient;
 #endif
 
     char MBconnectionFlag = 0;