ModbusEthernet: Portenta and ESP32 boards build fix

Author: emelianov

src/ModbusAPI.h

@@ -256,6 +256,8 @@ uint16_t ModbusAPI<T>::write(TYPEID id, TAddress reg, bool value, cbTransaction
 		return 0;
 	}
 }
+template <class T>
+template <typename TYPEID>
 uint16_t ModbusAPI<T>::write(TYPEID id, TAddress reg, uint16_t* value, uint16_t numregs, cbTransaction cb, uint8_t unit) {
 	switch (reg.type) {
 	case TAddress::COIL:

src/ModbusEthernet.h

@@ -10,16 +10,32 @@
 #endif
 #include "ModbusAPI.h"
 #include "ModbusTCPTemplate.h"
-
+#if defined(ARDUINO_PORTENTA_H7_M4) || defined(ARDUINO_PORTENTA_H7_M7) || defined(ARDUINO_PORTENTA_X8)
+#define MODBUS_ETH_WRAP_ACCEPT
+#undef MODBUS_ETH_WRAP_BEGIN
+#elif defined(ESP32)
+#undef MODBUS_ETH_WRAP_ACCEPT
+#define MODBUS_ETH_WRAP_BEGIN
+#else
+#undef MODBUS_ETH_WRAP_ACCEPT
+#undef MODBUS_ETH_WRAP_BEGIN
+#endif
 // Ethernet class wrapper to be able to compile for ESP32
 class EthernetServerWrapper : public EthernetServer {
     public:
     EthernetServerWrapper(uint16_t port) : EthernetServer(port) {
 
     }
+#if defined(MODBUS_ETH_WRAP_BEGIN)
     void begin(uint16_t port=0) {
-
+        EthernetServer::begin();
     }
+#endif
+#if defined(MODBUS_ETH_WRAP_ACCEPT)
+    inline EthernetClient accept() {
+        return available();
+    }
+#endif
 };
 
 class ModbusEthernet : public ModbusAPI<ModbusTCPTemplate<EthernetServerWrapper, EthernetClient>> {

src/ModbusTCPTemplate.h

@@ -259,7 +259,6 @@ void ModbusTCPTemplate<SERVER, CLIENT>::task() {
 			Serial.print(n);
 			Serial.print(": Bytes available ");
 			Serial.println(tcpclient[n]->available());
-#endif
 #endif
 			tcpclient[n]->readBytes(_MBAP.raw, sizeof(_MBAP.raw));	// Get MBAP