Would just be easier to implement an open source one from scratch given that most IOT modems are just (poorly written) software with an SDR anyway. CEVAwaves or

Would just be easier to implement an open source one from scratch given that most IOT modems are just (poorly written) software with an SDR anyway. CEVAwaves or RivieraWaves certainly is. If it can be done for BLE, 802.15.4 and WiFi, it can be done for cellular; ORAN is enough for base-stations so it's not totally secret. But at the end of the day, aside from the stupid ITU protocols, LTE/5g isn't rocket science. It's bog standard OFDMA radio -- nothing fancy these days. I ended up reverse engineering parts of Sony's Altair derived modems but got bored, maybe I should publish that