RYLR998 UART Interface 868/915 MHz Lora Module with Antenna FCC CE NCC IC Certification

The REYAX RYLR998 LoRa Module is an excellent choice for long-range wireless communication projects. Setup was straightforward using the UART interface, and the documentation provided made integration smooth. The module delivers stable performance with strong signal coverage, and the included antenna works well to maximize range. I really appreciate that it comes FCC, CE, and NCC certified, which adds confidence for both hobby and professional use. The build quality feels solid, and it has been running reliably in my IoT test setup without any issues. Overall, this is a high-quality LoRa module that’s easy to work with and provides excellent value. Perfect for IoT, remote sensing, and low-power wide-area applications. Highly recommended!

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 is the first Lora module I've worked with and I like that its a UART device so programming is as simple as any other serial device. The format for the messages is well documented as are all of the AT commands to configure it. I'm very impressed with it. I've been able to get good clear messages as far as 1.5Km despite being in a bit of a topographic hole. It would be much better if I had no obstructions but... I will say that the antenna solder pads are very delicate and I had one of them break free so the antenna moved around and was no longer connected. These things are tiny and fit on the head of a dime so just be careful with them and they should be fine.

[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.

Not the cheapest Lora solution by a wide margin, but quite possible one of the easiest, and more reliable

Very powerful!

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.

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.

All works good.

Funcionan muy bien aunque es importante resaltar que únicamente mediante un protocolo propietario, por lo que no son módulos LoRaWAN. Si esto se requiere, el módulo RYLR993 posee ambas modalidades y funcionan también de maravilla. He podido transferir datos de ida y vuelta a aproximadamente 5km

Absolutely outstanding little device So easy to use standby current sub 1mA, if I could give it bore than 5 star I would

Plugged straight into my phone with an adaptor I purchased. Worked right away.

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