ADR seemingly not working

[Will San Filippo]

Hello:

I have a Conduit mLinux model running lora-network-server version 1.0.41. I am using my own end device and lora stack and I am confused by something the server is doing. I have ADR on and I see that the server is sending a MAC command to set the DR to DR_0 (the lowest for the 902-928 band). The signal being received by the GW is very strong (I saw a log message saying SNR 102 cB). This seems to be well above what is necessary to use a higher data rate. Is there something I am not configuring correctly?

Here is the log of the server conf:
“lora” : {
“ADRStep” : 30,
“beaconDelay” : 0,
“beaconInterval” : 0,
“beaconPower” : 27,
“channelPlan” : “US915”,
“dutyCyclePeriod” : 60,
“eui_1” : “00:80:00:00:A0:00:0F:10”,
“frequencyBand” : “US915”,
“frequencyEU” : 867500000,
“frequencySubBand” : 1,
“joinByteOrder” : “LSB”,
“joinDelay” : 5,
“lbtEnabled” : false,
“lbtScanTime” : 5000,
“lbtSxOffset” : -4,
“lbtThreshold” : -65,
“maxDatarate” : null,
“maxDatarateEU” : 5,
“maxDatarateUS” : 4,
“maxTxPower” : 14,
“minDatarate” : null,
“minDatarateEU” : 0,
“minDatarateUS” : 0,
“netID” : “010203”,
“rx1DatarateOffset” : 0,
“rx1Delay” : 1,
“rx2Datarate” : 8,
“rx2Frequency” : 923300000,
“sxOffset” : -162

[Jason Reiss]

min/maxDatarate: null settings is the issue.

Set min to 0.
Set max to 3 or 4 for DR3 or DR4.

Ignore the US and EU min/max settings.

[Will San Filippo]

Thanks for the quick reply but no luck. Note that what I posted before was not the actual contents of /var/config/lora/lora-network-server.conf. Rather it was from the log. Should not be a big deal I hope.

I noticed that I received two MAC commands from the server. Here are the contents of each MAC command:

Mac Command 1:
datarate = 4
TxPower = 0
ChMask = 1
Redundancy = 0x71

This seems reasonable. It is telling me to use DR_4 and that the channel mask applies to channels 64-71 and to turn off all 125 kHz channels.

Mac Command 2:
datarate = 0
TxPower = 0
Redundancy = 1
ChMask = 0xff

This is the one that does not make sense. Well, the channel mask makes sense as it applies to the lower 8 channels and those are the ones I have enabled. However, why is it saying use DR_0? I would have thought it would say DR_3. Are there some other settings I need to change/set? Does Dwell Time have any effect on this? MaxTxPower?

Just as an FYI my .conf file has this in it:

“lora”: {
“netID”: “010203”, /* netID for beacon packets */
“frequencyBand”: “915”, /* US=”915″, EU=”868″ */
“channelPlan”: “US915″, /* US=”915″, EU=”868” */
“frequencySubBand”: 1, /* Sub-band for US operation, 1-8 */
“rx1DatarateOffset”: 0, /* Datarate offset for mote rx window 1 sent in join response (0-3) */
“rx2Datarate”: 8, /* Datarate for mote rx window 2 sent in join response EU:(0-7) AU/US:(8-13) */
“minDatarate”: 0, /* Minimum US tx data rate for ADR */
“maxDatarate”: 4, /* Maximum US tx data rate for ADR */
“maxTxPower”: 14, /* Max Tx power (dBm), -6 to 26 */
“ADRStep”: 30, /* 3 dB per ADR step */
“frequencyEU”: 867500000 /* center freq for extra EU channels (Hz) */

My log has this:
“lora” : {
“ADRStep” : 30,
“beaconDelay” : 0,
“beaconInterval” : 0,
“beaconPower” : 27,
“channelPlan” : “US915”,
“dutyCyclePeriod” : 60,
“eui_1” : “00:80:00:00:A0:00:0F:10”,
“frequencyBand” : “US915”,
“frequencyEU” : 867500000,
“frequencySubBand” : 1,
“joinByteOrder” : “LSB”,
“joinDelay” : 5,
“lbtEnabled” : false,
“lbtScanTime” : 5000,
“lbtSxOffset” : -4,
“lbtThreshold” : -65,
“maxDatarate” : 4,
“maxDatarateEU” : 5,
“maxDatarateUS” : 4,
“maxTxPower” : 14,
“minDatarate” : 0,
“minDatarateEU” : 0,
“minDatarateUS” : 0,
“netID” : “010203”,
“rx1DatarateOffset” : 0,
“rx1Delay” : 1,
“rx2Datarate” : 8,
“rx2Frequency” : 923300000,
“sxOffset” : -162
},

Thanks!

[Jason Reiss]

The first Adr downlink is used to setup the channel mask to the channels supported by th e gateway in case a device joined with 64 channels enabled.

The datarate is not adjusted until 6 uplinks have been received to determine best datarate.

Max tx power is gw transmit.
Dwell time is only used in AS923.

[Author]

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