/** Called when it's time to clean up disconnected Connection objects */
void clearDisconnected() {
for (int i = connections.size() - 1; i >= 0; i--) {
GsmConnection cn = (GsmConnection) connections.get(i);
if (cn.getState() == State.DISCONNECTED) {
connections.remove(i);
}
}
if (connections.size() == 0) {
state = State.IDLE;
}
}
