The TTN EU868 frequency plan defines, emphasis mine:
- 868.1 - SF7BW125 to SF12BW125
- 868.3 - SF7BW125 to SF12BW125 and SF7BW250
- 868.5 - SF7BW125 to SF12BW125
- 867.1 - SF7BW125 to SF12BW125
- 867.3 - SF7BW125 to SF12BW125
- 867.5 - SF7BW125 to SF12BW125
- 867.7 - SF7BW125 to SF12BW125
- 867.9 - SF7BW125 to SF12BW125
- 868.8 - FSK
CFListin the OTAA Join Accept nicely adds 867.1 thru 867.9, but neither enables DR6/SF7BW250 for 868.3, nor adds 868.8 with DR7/FSK. Even more, the specifications do not support using
In this case the CFList is a list of five channel frequencies for the channels four to eight whereby each frequency is encoded as a 24 bits unsigned integer (three octets). All these channels are usable for DR0 to DR5 125kHz LoRa modulation. The list of frequencies is followed by a single RFU octet for a total of 16 octets.
After manually configuring DR6 and DR7, I can see through an RTL-SDR receiver that an RN2483 transmits just fine. But a nearby Kickstarter The Things Gateway does not receive the transmissions.
So, not a problem for me but curious: is all of the above expected?
Asides: I tried with both a The Things Uno RN2483, and MCCI LMIC/RFM95 with
DR_FSK LMIC never gets an
EV_TXCOMPLETE and the RTL-SDR shows it keeps transmitting endlessly, for two Heltec WiFi LoRa 32 devices; could be some wiring.) On the gateway, an attached UART does not show
LORA: Accepted packet nor something FSK-related, no matter how often I try. And for example the TTN LoRaWAN library does not support DR6 and DR7 for ABP either. (Even more, it only allows for changing the SF, while SF7 could be either BW125 or BW250.)
Enable DR6 and DR7 on RN2483
Microchip’s RN2483 manual states:
For the actual values of the data rates and the corresponding spreading factors (SF), refer to the LoRaWAN™ Specification.
So, as per the February 2017 1.0.2 Rev B Regional Parameters:
DataRate Configuration Indicative physical
bit rate [bit/s]
0 LoRa: SF12 / 125 kHz 250 1 LoRa: SF11 / 125 kHz 440 2 LoRa: SF10 / 125 kHz 980 3 LoRa: SF9 / 125 kHz 1760 4 LoRa: SF8 / 125 kHz 3125 5 LoRa: SF7 / 125 kHz 5470 6 LoRa: SF7 / 250 kHz 11000 7 FSK: 50 kbps 50000 8…15 RFU
The January 2015 LoRaWAN 1.0 specification defines the same.
Commands for an RN2483:
sys factoryRESET --> RN2483 1.0.1 Dec 15 2015 09:38:09 mac get ch freq 2 --> 868500000 # After reset, it only knows the 3 default channels 0..2 mac get ch freq 3 --> 0 mac set deveui 0004............ mac set appeui 70B3D57ED....... mac set appkey C491............................ # Required for mac save to work after OTAA join: mac set devaddr 00000000 mac set nwkskey 00000000000000000000000000000000 mac set appskey 00000000000000000000000000000000 mac join otaa mac save # After join, it knows all 8 TTN channels, 0..7 mac get ch freq 3 --> 867100000 mac get ch freq 7 --> 867900000 mac get ch freq 8 --> 0 # Try DR6 mac set dr 6 --> invalid_param # Try DR7 mac set dr 7 --> invalid_param mac get ch freq 1 --> 868300000 mac get ch drrange 1 --> 0 5 # Make 868.3 use DR6 as well mac set ch drrange 1 0 6 # Add channel 8 for DR7, FSK mac set ch freq 8 868800000 mac set ch dcycle 8 799 mac set ch drrange 8 7 7 mac set ch status 8 on mac save mac set dr 6 --> ok mac tx uncnf 1 123456 --> mac_tx_ok mac set dr 7 --> ok mac tx uncnf 1 123456 --> mac_tx_ok