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LoRaWAN ® L2 1.0.4 Specification © 2020 LoRa Alliance ® Page 27 of 90 The authors reserve the right to change specifications without notice. CID Command Transmitted by Brief Description End- device Network Server 0x02 LinkCheckReq x Used by an end-device to validate its connectivity to a network. 0x02 LinkCheckAns x Answers LinkCheckReq. Contains the received signal power estimation, which indicates the quality of reception (link margin) to the end-device. 0x03 LinkADRReq x Requests the end-device to change data rate, TX power, redundancy, or channel mask. 0x03 LinkADRAns x Acknowledges LinkADRReq. 0x04 DutyCycleReq x Sets the maximum aggregated transmit duty cycle of an end-device. 0x04 DutyCycleAns x Acknowledges DutyCycleReq. 0x05 RXParamSetupReq 7 x Sets the reception slot parameters. 0x05 RXParamSetupAns x Acknowledges RXParamSetupReq. 0x06 DevStatusReq x Requests the status of the end-device. 0x06 DevStatusAns x Returns the status of the end-device, namely its battery level and its radio status. 0x07 NewChannelReq x Creates or modifies the definition of a radio channel. 0x07 NewChannelAns x Acknowledges NewChannelReq. 0x08 RXTimingSetupReq 7 x Sets the timing of the reception slots. 0x08 RXTimingSetupAns x Acknowledges RXTimingSetupReq. 0x09 TXParamSetupReq 7 x Used by a Network Server to set the maximum allowed dwell time and MaxEIRP of end-device, based on local regulations. 0x09 TXParamSetupAns x Acknowledges TXParamSetupReq. 0x0A DlChannelReq 7 x Modifies the definition of a downlink RX1 radio channel by shifting the downlink frequency from the uplink frequencies (i.e. creating an asymmetric channel). 0x0A DlChannelAns x Acknowledges DlChannelReq. 0x0B to 0x0C RFU 0x0D DeviceTimeReq x Used by an end-device to request the current GPS time. 0x0D DeviceTimeAns x Answers DeviceTimeReq. 0x0E to 0x0F RFU 0x10 to 0x1F Class B commands (cf. Sections 12). 0x20 to 0x2F Reserved for Class C commands. 0x30 to 0x7F RFU 0x80 to 0xFF Proprietary x x Reserved for proprietary network command extensions. Table 14: MAC commands 829 830 831 7 This command has a different acknowledgment mechanism as described in the command definition.