More Checksum mismatches with Expander connected

[JensOgorek]

Even with the fix from #134 there are still checksum mismatches happening with an expander in use.
Unlike the #134 checksum mismatches, they seem to not break the whole robot after a while, and they are rarer.

Some mismatches from my last test

These were printed with a debug output

bumper_front_bottom.active=true;bumper_front_bottom.change=0;bumper_front_bottom.inverted=false;bumper_front_bottom.level=1;")
bumper_front_bottom.active=true;bumper_front_bottom.change=0;bumper_front_bottom.inverted=false;bumper_front_bottom.level=1;
error in module "p0": checksum mismatch
 
s.battery_control_status.active=true;battery_control_status.change=0;battery_control_status.inverted=false;battery_control_status.evel=1;
error in module "p0": checksum mismatch
 
s.lattery_control_status.active=true;battery_control_status.change=0;battery_control_status.inverted=false;battery_control_status.lvel=1;
error in module "p0": checksum mismatch
 
 s!battery_control_status.active=true;battery_control_status.change=0;battery_control_status.inverted=false;battery_control_statuslevel=1;
error in module "p0": checksum mismatch
 
s.battery_control_status.active=true;battery_control_status.change=0;battery_control_status.inverted=false;battery_control_status.evel=1;
error in module "p0": checksum mismatch
 
 s!battery_control_status.active=true;battery_control_status.change=0;battery_control_status.inverted=false;battery_control_statulevel=1;
error in module "p0": checksum mismatch

This is from a normal test without debug outputs:

p0: 5
error in module "p0": checksum mismatch