Softwareserial.h Library [best] May 2026

SoftwareSerial port1(2, 3); SoftwareSerial port2(4, 5); void setup() port1.begin(9600); port2.begin(9600); port1.listen(); // port1 is active

port1.listen(); // Switch back

Default buffer is 64 bytes. Modify SoftwareSerial.h in your Arduino core: softwareserial.h library