@kduino said in How to use SoftwareSerial Library?:

Hi PJR,
would you mind explaining me the reason for defining MY_RS485_HWSERIAL?
Thank you,
by kduino

Take a look at MySensors.h:

#elif defined(MY_RS485)
  #if !defined(MY_RS485_HWSERIAL)
    #if defined(__linux__)
      #error You must specify MY_RS485_HWSERIAL for RS485 transport
    #endif
    #include "drivers/AltSoftSerial/AltSoftSerial.cpp"
  #endif
  #include "hal/transport/MyTransportRS485.cpp"
..

If I read this correctly it loads also AltSoftSerial if you dont define MY_RS485_HWSERIAL
Of course I can read this wrong..

@user2684 wow, that was fast! Thanks!

@rakeshpai I can understand that. Not sure about the amount of rs485 users but one at least

Just an idea:
I would try adding:

#elif defined(MY_RS485_SWSERIAL)
SoftwareSerial& _dev = MY_RS485_SWSERIAL;

so it looks like this:

#if defined(__linux__)
SerialPort _dev = SerialPort(MY_RS485_HWSERIAL);
#elif defined(MY_RS485_SWSERIAL)
SoftwareSerial& _dev = MY_RS485_SWSERIAL;
#elif defined(MY_RS485_HWSERIAL)
HardwareSerial& _dev = MY_RS485_HWSERIAL;
#else
AltSoftSerial _dev;
#endif

and in your code define:

#define MY_RS485_HWSERIAL
#define MY_RS485_SWSERIAL mySerial

and see what happens

ps. the #define of MY_RS485_HWSERIAL is still there since I'm not sure what will be missing for serial communication if that is not defined.

Feature request: support for RS485 network!

"Writing multiple SOH"
Most likely not the problem what AP has but I think its good to mention also in this thread: https://forum.mysensors.org/post/56960

V_HVAC_FLOW_MODE, V_HVAC_SPEED and V_HVAC_FLOW_STATE handling still missing.
No smartSleep implementation yet.

I think there is couple things you need to tweak if you want to use SoftwareSerial instead of AltSoftSerial since its quite well baked in the default solution.

See these:

• https://github.com/mysensors/MySensors/blob/development/MySensors.h#L298
• https://github.com/mysensors/MySensors/blob/development/core/MyTransportRS485.cpp#L99

Will the result change if you add more sync(SOH) chars?

@kimot what hw you are using? MCP2515 + MCP2551?