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820a3976ad
This moves the following parts of ethos' state machine out of ISR context: - Sending and replying to HELLO messages - Byte-unstuffing Some escape handling is still needed in the ISR handler, due to ethos' protocol design, to determine if a received byte must go into the netdev queue (tsrb) or the STDIO queue (isrpipe), but the actual unstuffing is now done in the STDIO and netdev handler threads, respectively.