REYAXRYLR998 UART Interface 868/915 MHz Lora Module with Antenna FCC CE NCC Certification

The media could not be loaded. So I had ChatGPT craft python code that did random byte send and pushed the RYLR998 to the breaking point. I had the code send random length characters with payloads up to 32 Bytes with no delay and then had Python graph the throughput. The data stream capped out at about 3,500 Bps before the frame buffer became overloaded. Overall I am impressed with the ease of use, the fact it uses simple easily understood AT commands, the simple wiring to a USB TTL interface, and general performance when I hammer it with garbage to send.

This device works excellent and the range is very good.Best I have tested so far and easy to setup and code.I was able to send some Arduino Json payloads.

This was a really easy solution to implement. I did find that I had to tweak my interrupt priorities since 115 kbaud can easily overrun my uart. I especially like that I can monitor comms using a terminal emulator (eg YAT).

Amazing little units that are super easy to use. Love it!

[Edit 2024-05-13]Regarding stability: I wrote some C code, replacing the micropython, and found that the key to getting reliability is not to simply DELAY, but to always check for +OK or +ERR after each time sending data to the LoRa module, including when setting up configuration. The code works fine without a single sleep,, and spends most of its time waiting for serial input from the module. I am not counting +RCV as confirmation for the previous request sent over serial to the module.[Edit 2024-05-09]Did some distance testing, had an echo-server on second floor at home, and another with me, which lit a led while getting echoes in return, and turning it off if no data received. There are a bit of both low and high buildings here, and I am impressed with the range. Did not see signal strength, only success or failure, through the led, but got clear signals at least 3-400 meters away, through some threes, and even behind small bumps in the landscape. I had been worried that having only one inside the house would greatly limit range, if not in line with a window, but that didn't seem to matter. Incredible little radios!![Original review]I started out using an FTDI chip from my Linux PC, but got +ERR=1 on every keypress. It seems the terminal emulators I tried sent each keypress, instead of buffering up a line, and send it followed by \r\n which the LoRa chip expects.So I hooked up two Raspberry Pi Pico to control the LoRa modules, and in front of that, two Raspberry Pi, flashing them with micropython and developing with thonny.Getting the first message across was easy, but it felt unreliable. After some testing I figured out that after each command is sent to the LoRa module, it is best to delay a couple of seconds before the next, as well as reading any serial input as well before the next command.I tried connecting from basement to two floors up, and it works great, at -50 signal strength.I am very satisfied with the result so far, and look forward to do outdoor testing.

I tried both the REYAX RYLR896 and the RYLR998 because I wanted the ability to set the address, network ID, etc. These REYAX modules will frustrate you. I dealt with weird inconsistent issues. Maybe try them with the Arduino mini? I am using the Arduino and the Nano which required a voltage divider. I watched lots of YouTube videos and read many online posts that provided examples. I would get them to work and then they would fail. I'm going back to Maduino from Makerfabs Product Code: OAC915MLR for LoRa connectivity. Good luck if you decide to try these.

Cool little transceivers. Simple AT command structure with a usable default configuration. The only caveat is that they do not buffer messages, and the need a CR/LF end to each line. Putty cannot send a CR/LR so use Tera Term. To get around the buffering of messages, I suggest copying and pasting the whole message (with the newline) into terminal so that it all gets sent together.I did end up writing some Arduino code with a QT-py board to do the buffering and CR -> CR/LF conversion for me so that I can just type commands into Putty. Wasn't too bad, I'll update this review with the code if I post it on github.Videos show 8+ km range with the default settings and the little curly antennas. I'd expect with some settings changes to a lower bitrate these could go well over 10 miles but no proof.Overall awesome little boards, theres also a version with an antenna connector for using a proper 915 MHz dipole antenna.

Good