The SerialSimLink only has an _sl member if serial initalization was
successfull. If we close a serial connection, check if we even have the
_sl member. Otherwise move on silently.
Change-Id: Ic3f3f5e50d780f424da7d0be5733d7167bb7159c
The most common reason for pySim to crash is when it is executed without
commandline parameters. Then pySim will expect a serial reader on
/dev/ttyUSB0 since this is the default. Lets check if /dev/ttyUSB0 even
exists before trying to open it.
Change-Id: I7545c728b531e9a796eee8f80f0b08d4097f8399
In Python 3, traditional division operator returns a float,
while we need a floor integer in the most cases.
Change-Id: I5565eb64a1ddea7075cbb142eaacaa5d494c87bb
