Purtroppo nulla mi dà questo errore:
C:\Users\Gianni\Documents\arduino-1.0.1\libraries\PubSubCLientGSM\SIM900.cpp: In member function 'void SIMCOM900::SimpleWrite(uint8_t*)':
C:\Users\Gianni\Documents\arduino-1.0.1\libraries\PubSubCLientGSM\SIM900.cpp:371: error: call of overloaded 'write(uint8_t*&)' is ambiguous
C:\Users\Gianni\Documents\arduino-1.0.1\libraries\PubSubCLientGSM/SoftwareSerial.h:92: note: candidates are: virtual size_t SoftwareSerial::write(uint8_t) <near match>
C:\Users\Gianni\Documents\arduino-1.0.1\hardware\arduino\cores\arduino/Print.h:49: note: size_t Print::write(const char*) <near match>