{'fraction_non_alphanumeric': 0.021033653846153848, 'fraction_numerical': 0.010216346153846154, 'mean_word_length': 5.55511811023622, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
A CoAP-based Communication Mapping Method for Power Distribution Internet of Things

1 This paper studies a constrained application protocol (CoAP) mapping method based on EEC61850 for achieving the abstract communication service interface (ACSI) to solve the problems of weak monitoring, poor equipment interconnection, and difficult maintenance in the low-voltage power distribution Internet of Things (IoT). It can realize the interconnection, interoperability and access of large-scale sensing terminal equipment. The requirements of power consumption, transmission rate, device performance and deployment cost of terminal devices in consideration of the resource-constrained operation scenarios of distribution IoT devices are analyzed to determine the subset of ACSI services. In addition, the communication service method adopted when the system is designed is directly mapped, which not only accelerates the speed of information transmission, but also greatly simplifies the conversion time between IEC61850 and data. In this paper, based on the operation process of CoAP distributed Internet technology, a new data resource access form is developed, which can not only quickly convert SCL files into URIs, but also access the flies. Further, considering the coding efficiency and cost of the existing coding methods in IEC61850 and the Internet of Things, the operation mode of the ASN.1BER data runtime is made, so as to construct a separate CoAP data mapping method. Finally, we also conducted detailed tests to verify the characteristic of CoAP mapping with help of data test platform, proving the feasibility of this method from multiple perspectives.