Race conditions cause the simulator to get "stuck" and not proceed #151
Description
When I tried to apply @Abby-Wheelis's changes in #120 to support error conditions in the AC ISO demo, it looked like they weren't triggering errors. I was worried that maybe the MQTT messages weren't being sent properly, so I tried to copy over the errors from the dropdown.
However, in this case, the AC ISO15118-2 sim_command
sleep 1;iso_wait_slac_matched;iso_start_v2g_session ac,-1,-1;iso_wait_pwr_ready;iso_draw_power_regulated 16,3;sleep 36000#iso_stop_charging;iso_wait_v2g_session_stopped;unplug#iso_pause_charging;iso_wait_for_resume#iso_start_bcb_toogle 3;iso_wait_pwm_is_running;iso_start_v2g_session AC_three_phase_core,-1,-1;iso_wait_pwr_ready;iso_draw_power_regulated 16,3;sleep 36000
worked consistently, but the error sim_command did not
sleep 1;iec_wait_pwr_ready;sleep 1;draw_power_regulated 32,3;sleep 5;diode_fail;sleep 36000#unplug#iso_wait_for_resume#sleep 1;iec_wait_pwr_ready;sleep 1;draw_power_regulated 32,3;sleep 5;diode_fail;sleep 36000