I just want to be really clear that the very slow connection speed and non-response is A PROBLEM WITH THE XBEE ITSELF, NOT THE CODE.
The messages like “no response received” are merely letting you know that the Bee is not responding.
There is nothing I’ve done in the code recently that changed it from “not working” to “working” with the LTE-M XBee3. I’ve done a lot more testing and tweaks to make it work better, that’s all. The basic code has been working as long as the module has been available.