Issue link: https://read.uberflip.com/i/1428383
LoRaWAN 1.0.3 Specification ©2018 LoRa™ Alliance Page 50 of 72 The authors reserve the right to change specifications without notice. • Periodicity = 0 means that the end-device opens a ping slot approximately every 1320 second during the beacon_window interval 1321 • Periodicity = 7 , every 128 seconds which is the maximum ping period supported by 1322 the LoRaWAN Class B specification. 1323 To change its ping slot periodicity a device SHALL first revert to Class A , send the new 1324 periodicity through a PingSlotInfoReq command and get an acknowledge from the server 1325 through a PingSlotInfoAns . It MAY then switch back to Class B with the new periodicity. 1326 This command MAY be concatenated with any other MAC command in the FHDRFOpt field 1327 as described in the Class A specification frame format. 1328 14.2 BeaconFreqReq 1329 This command is sent by the server to the end-device to modify the frequency on which this 1330 end-device expects the beacon. 1331 1332 Octets 3 BeaconFreqReq payload Frequency Figure 16 : BeaconFreqReq payload format 1333 The Frequency coding is identical to the NewChannelReq MAC command defined in the 1334 Class A. 1335 Frequency is a 24bits unsigned integer. The actual beacon channel frequency in Hz is 100 x 1336 frequ. This allows defining the beacon channel anywhere between 100 MHz to 1.67 GHz by 1337 100 Hz step. The end-device has to check that the frequency is actually allowed by its radio 1338 hardware and return an error otherwise. 1339 A valid non-zero Frequency will force the device to listen to the beacon on a fixed frequency 1340 channel even if the default behavior specifies a frequency hopping beacon (i.e US ISM band). 1341 A value of 0 instructs the end-device to use the default beacon frequency plan as defined in 1342 the "Beacon physical layer" section. Where applicable the device resumes frequency hopping 1343 beacon search. 1344 Upon reception of this command the end-device answers with a BeaconFreqAns message. 1345 The MAC payload of this message contains the following information: 1346 Size (bytes) 1 BeaconFreqAns payload Status Figure 17 : BeaconFreqAns payload format 1347 The Status bits have the following meaning: 1348 Bits 7:1 0 Status RFU Beacon frequency ok 1349 Bit = 0 Bit = 1 Beacon frequency ok The device cannot use this frequency, the previous beacon frequency is kept The beacon frequency has been changed 1350