### Basic Info - [x] This issue complies with the [issue POLICY doc](https://github.com/esp8266/Arduino/blob/master/POLICY.md). - [x] I have read the documentation at [readthedocs](https://arduino-esp8266.readthedocs.io/en/latest) and the issue is not addressed there. - [x] I have tested that the issue is present in current master branch (aka latest git). - [x] I have searched the issue tracker for a similar issue. - [x] If there is a stack dump, I have decoded it. - [ ] I have filled out all fields below. ### Problem Description The espsoftwareserial release included in the 2.6.3 release is not working for readBytes() anymore, see https://github.com/plerup/espsoftwareserial/issues/128 for details. This is a tracker issue in the hope that a 2.6.4 release can be cut when the issue is fixed.