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8bc894a439da

SVGHMI: reflect changes in Beremiz' SVGHMI for multiclient

pthread_mutex_lock(&UART_WakeCondLock);

UART_task_active = 0;

pthread_cond_signal(&UART_WakeCond);

pthread_mutex_unlock(&UART_WakeCondLock);

pthread_join(UART_task, NULL);

closeserial(UART_fd);