LoRa technology enables long range, low power consumption and secure data transmission features. By multi-hop communication, we argue that LoRa is potentially very useful for the monitoring system for wide area with long distance. In this paper, we propose a protocol with reliable multi-hop communication for linear network including network constructing period and data operating period using LoRa. Also, we analyze and show the tradeoffs among synchronization time interval, clock drift rate and configurations in LoRa. Our experimentation using five nodes can form a linear network and delivery reliability achieves above 95% in case of adapting one-time retransmission.
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