Some pins cannot be used as transmit pins in SoftwareSerial.

[SuguruHarada64]

■ Corresponding version
v.1.3.0 to v.2.3.2

■ API function affected by defect

• SoftwareSerial()
  • SoftwareSerial() is a constructor function for creating an instance of the SoftwareSerial class.
  • The first argument is the pin to receive, the second argument is the pin to transmit.

■ Contents and Occurrence conditions
When a specific pin is specified as the second argument of SoftwareSerial(), print(), println() and write() do not output data.

Pin numbers are shown below. (Port number in parentheses)
31(P17), 32(P16), 33(P15), 34(P14), 35(P13), 36(P12), 37(P11),
38(P10), 39(P146), 40(P147), 42(P130), 43(P01), 44(P00), 45(P141),
46(P140), A0(P22), A1(P23), A2(P24), A3(P25), A4(P26), A5(P26)

■ Workaround
None

■ Permanent measures
Scheduled to be fixed in v.2.4.0