samples: bluetooth: add error message on overstay

In case someone modifies the nrf_dm sample, he might increase the
amount of time needed in the timeslot. If that is the case, the
customer would just see an non-understandable MPSL assertion error.
Improved this by printing an error message. There will still be an MPSL
assertion, but hopefully with this people will know how to resolve it.

Signed-off-by: Jan Müller <[email protected]>

Author: Tschet1

subsys/dm/dm.c

@@ -207,7 +207,11 @@ static mpsl_timeslot_signal_return_param_t *mpsl_timeslot_callback(
 		dm_api_call = TIMESLOT_RESCHEDULE;
 		k_msgq_put(&dm_api_msgq, &dm_api_call, K_NO_WAIT);
 		break;
+	case MPSL_TIMESLOT_SIGNAL_OVERSTAYED:
+		LOG_ERR("overstayed the timeslot: consider increasing DM_TIMESLOT_OVERHEAD_US");
+		break;
 	default:
+		LOG_ERR("Unexpected timeslot signal (%u)", signal_type);
 		break;
 	}