Re: icmp

[David Ranch <linux-hams@trinnet.net>]

Considering I have no experience with some of these LoRa data modules, 
what is this resulting in terms of modulation type, data rate and over 
what kind of distance?

--David
KI6ZHD


On 04/01/2016 01:14 PM, folkert wrote:
> Ah darn, of course!
> Thanks.
>
> Regarding the lora configuration: a friend of mine gave me the
> configuration-parameters for best reliability for a long distance:
>
> const RH_RF95::ModemConfig cfg = {
>                  // Register 0x1D:
>                  // BW         CR      0=explicit
>                  (8 << 4) | (4 << 1) | (0 << 0),
>                  // Register 0x1E:
>                  // SF       CRC enable
>                  (10 << 4) | (1 << 2),
>                  // Register 0x26:
>                  // bit3 = LowDataRateOptimization
>                  (0 << 3)
>          };
>                  rf95.setModemRegisters(&cfg);
>                  rf95.setFrequency(869.850);
>                  rf95.setPreambleLength(8);
>
> Packet loss is 12-15%.
>
>
> On Fri, Apr 01, 2016 at 12:41:59PM -0700, David Ranch wrote:
>>
>> This is because you have your window setting per the /etc/ax25/axports file
>> set to 1.   Change it to say 4 and things should work better.
>>
>> Btw.. what speed are you running your LoRa network at?  A round trip time of
>> 1.6 seconds is quite slow but maybe that's due to the serialization delays
>> of running your network at say 300bps!
>>
>> --David
>>
>>
>> On 04/01/2016 12:07 PM, folkert wrote:
>>> An other strange thing: I can't have 2 packets in that 2 second
>>> interval. E.g. a traceroute only works if I add -N 1 -w 2.
>>>
>>> On Fri, Apr 01, 2016 at 08:42:26PM +0200, folkert wrote:
>>>> Hi,
>>>>
>>>> This evening I succeeded in doing ICMP over AX.25 over LoRa(!)!
>>>>
>>>> root@savannah:~/data/mkiss_moteino# ping -i 5 192.168.5.1
>>>> PING 192.168.5.1 (192.168.5.1) 56(84) bytes of data.
>>>> 64 bytes from 192.168.5.1: icmp_seq=4 ttl=64 time=4524 ms
>>>> 64 bytes from 192.168.5.1: icmp_seq=7 ttl=64 time=1601 ms
>>>> 64 bytes from 192.168.5.1: icmp_seq=8 ttl=64 time=1601 ms
>>>> 64 bytes from 192.168.5.1: icmp_seq=9 ttl=64 time=1601 ms
>>>> ^C
>>>> --- 192.168.5.1 ping statistics ---
>>>> 9 packets transmitted, 4 received, 55% packet loss, time 40005ms
>>>> rtt min/avg/max/mdev = 1601.358/2332.248/4524.246/1265.550 ms
>
>
> Folkert van Heusden
>