Of the following options, () is a narrowband wireless IoT solution based on the 3GPP standard developed specifically for the industry IoT market?
CoAP protocol message format is simple, messages can be very short, using long connections, there is a heartbeat preservation mechanism.
Huawei Power IoT Solution's main application modules include ()? (Multiple choice)
The southbound device sends an AT command to SoftRadio through the serial port, and the result is that SoftRadio does not have any information prompt, possible reasons are ()? (Multiple choice).
Sigfox utilizes ultra-narrow UNB technology, so his transmission rate is lower, usually ()?
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