Timothy Woo

Try not connecting DTR at all and try `fona.enableSleepMode(true); fona.set_eDRX(1, 2, "0010");`

The ESP32_LTE_Demo should work just fine. Please make sure you use the 'G' command first before using the '2' command to do a GET command. POST should also work but...

Make sure you have a LiPo battery connected with the correct polarity. That is usually the problem for power issues. The red wire of the battery should be on the...

Like I said, a strong 5V supply on the "5V" pin won't power it adequately. You must have a strong 3.7V source connected to VBAT (please beware, 5V is too...

Sorry, you're not using the Botletics hardware.

You're asking questions related to the hardware of the board itself, like pin definitions. I wouldn't know, sorry. Please contact Waveshare's customer support.

(Also, as a side note, please note that the suggestions on power supply I mentioned earlier above will not necessarily apply to your case because I thought you were using...

Have you looked at [the firmware files on GitHub](https://github.com/botletics/SIM7000-LTE-Shield/tree/master/SIM7000%20Documentation/Firmware)?

I think it should be possible, but I haven't looked into it.

I'm not sure about deleting all SMS from the network, but for deleting from the modem, just read the number of SMS and get their indices and create a loop...