Abstract: A computer-implemented character-string analysis method and associated device are provided for determining reliability of a communication network. The procedures include: assigning a priority to a message for sending by a signal carrier at the transmitting node; determining throughput of the signal carrier based on the priority; establishing latency of the message; calculating a packet error rate of the message; calculating dropout time between the transmitting and receiving nodes; and calculating a reliability index of the message. The latency represents delay between transmission time and reception time. The delay is affected by hardware, environment and distance between the transmitting and receiving nodes. The process accepts the message in response to the reliability index satisfying an acceptance threshold.