fixed KeyError on timessent in sndrcv when an error happens during a send #1937
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Currently, in sndrcv, when an error happens during the send operation it gets logged and execution continues. However, since timessent is not populated, a KeyError will be raised at the line
p.sent_time = timessent[i]
. I added a check to verify that the key is present in the timessent dict.This PR also fixes ISOTPSoftSocket.sr1 not returning after the specified timeout, and I added 2 unit tests for that.