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sh123 / esp32_loraprs

LoRa ESP32 KISS Bluetooth modem (for APRSDroid or aprs.fi iOS) + APRS-IS RX/TX iGate over WiFi + Digipeater + DV (with Codec2 Walkie-Talkie)
https://github.com/sh123/esp32_loraprs
GNU General Public License v3.0
187 stars 38 forks source link

Syncword 0xf3 #7

Closed Cloolalang closed 4 years ago

Cloolalang commented 4 years ago

I had some feedback from the TTN forum regarding my APRS IGate setup:

https://www.thethingsnetwork.org/forum/t/the-amateur-radio-corner/5252/68

Opinion on syncword.

sh123 commented 4 years ago

Could be changed, which value is suggested? Is there any common agreement in LoRa community on which one to use to be compatible?

sh123 commented 4 years ago

I think it should be 0x3f, but not 0xf3, probably typo, I'll fix that

sh123 commented 4 years ago

Changed to 0x3f

Cloolalang commented 4 years ago

Hey, thanks, I will update my setup. I have joined this group https://github.com/sh123/esp32_loraprs/issues/7 and there is a discussion about sync word here: https://www.thethingsnetwork.org/forum/t/the-amateur-radio-corner/5252/70

73 Patrick ZS1dbm

sh123 commented 4 years ago

There are more thoughts about compatibility.

This project is using AX25 when sending data over LoRa (as per http://www.aprs.org/doc/APRS101.PDF page 12) and encapsulates AX25 frames into KISS when packets are transferred to/from TNC over serial Bluetooth to be compatible with existing TNC KISS interface in Linux software, so you can use kissattach in Linux and put up network interface. This is the same approach used by classical APRS AFSK frames and TNCs.

However, some existing LoRa APRS software implementations just send plain APRS text messages over the RF. These formats won't be compatible as they are just plain text, but not AX25 frames.

Cloolalang commented 4 years ago

Interesting, After reading this https://github.com/sh123/esp32_loraprs/issues/7#event-3452266887 I have decided to just use sync word 0x34 for now.

I am also looking at testing a non-ham ISM compatible version with CBAPRS.de

Here is another ESP32/LoRa-APRS:

https://github.com/peterus/LoRa_APRS_iGate

My IGate is working very well., I have had 17km on my first drive test, 73 Patrick ZS1dBm

sh123 commented 4 years ago

Quite good range for QRPP, I'll change syncword to 0x34.