Lora: Documentation vs. Example code regards OTAA

[jmarcelino]

I think the problem you're having with OTAA is related to you not receiving downlinks properly https://forum.pycom.io/topic/1254/ttn-otaa-join-acknowledgement-not-being-received/13 and not the Dev EUI

[robert-hh]

@jmarcelino Agreed, because that's what is see with ABP mode too.

[ssmith]

@jmarcelino Since updating to 1.16 I'm getting this error when trying to connect.

[   388.642] Received packet: {"rxpk": [{"data": "AFlERE/vvq3e6FJQ/v+krjC7ifKetjw=", "time": "2018-02-19T13:38:40.120571Z", "chan": 0, "tmst": 388895160, "stat": 1, "modu": "LORA", "lsnr": 5.0, "rssi": -17, "rfch": 0, "codr": "4/5", "freq": 918.9, "datr": "SF7BW125", "size": 23}]}
[   388.675] Push ack
[   393.694] Pull rsp
Unhandled exception in callback handler
Traceback (most recent call last):
  File "lorawan_nanogateway.py", line 386, in <lambda>
  File "lorawan_nanogateway.py", line 345, in _send_down_link
ValueError: frequency 923300000 out of range

[jmarcelino]

@ssmith
Which region are you in please and what frequency is LORA_FREQUENCY set to in config.py?

This error seems related to the recent LoRa region changes in 1.16 but it's strange that the nanogateway is able to listen on the correct frequency but not transmit on 923300000.

[ssmith]

@jmarcelino, region=LoRa.US915,. This worked fine with 1.15. and here is lora config

lora.init(mode=LoRa.LORA, frequency=918900000, power_mode=LoRa.ALWAYS_ON, tx_power=20, bandwidth=LoRa.BW_125KHZ, sf=7,
              preamble=8, coding_rate=LoRa.CODING_4_8, tx_iq=False, rx_iq=False)

[jmarcelino]

@ssmith
Could you add region=LoRa.US915 as a parameter in both lora.init() please?

[ssmith]

@jmarcelino It's there, that was a different config file from my previous test just to show the frequency. Here's the config from the nano_gateway file.

        self.lora = LoRa(
            mode=LoRa.LORA,
            region=LoRa.US915,
            frequency=self.frequency,
            bandwidth=self.bw,
            sf=self.sf,
            preamble=8,
            coding_rate=LoRa.CODING_4_5,
            tx_iq=True
        )

[ssmith]

@jmarcelino I also tried AU915 with the same result. I'll try EU next. I assume with the generic FW now that it should accept it.

[robert-hh]

@jmarcelino Cannot try more, I think I expired my downlink message quota (of 10?) for the day.

[ssmith]

@robert-hh Are you going to TTN? I've sent thousands of messages there in a day during testing.

[ssmith]

@jmarcelino Wasn't able to get EU868 to work with LoRaWAN. Gave me a frequency error. I was able to set it up and send raw LoRa between 2 LoPy4's at both 868 and 915 bands without changing the FW. Looks like it is in the LoRaWAN stack.

[robert-hh]

@ssmith Yes, I'm using TTN. As far as I can could read, the limit is for downlink messages, from TTN to the node. Uplink, to TTN, I did not experience any limit.

[robert-hh]

@ssmith Besides that, no luck. Simple device-to-device works, the power getting out of the antenna looks similar, with the FiPy a little bit (25% = 2 dB) stronger. But that may be within the setup-variation.

[asavvin]

Hello!
I am having issue with activating using method otaa lopy with ttn gateway fot US915.
whats correct code i should use I searched a lot of topics over weekend and could not find correct code.
Thank you

Same time using ttn node US915 with ttn gateway activation worked as shown.