The new BY70-2 telemetry decoder needs a kiss file based on the updated gr-satellites (master branch) block KISS File Sink. This version implements an extension to the KISS protocol. Before each data frame, a KISS control frame with the timestamp encoded as the UNIX epoch in milliseconds in big-endian uint64_t format and a control byte of 0x09 is used. Great thanks to Dani for this implementation.