@ldbm we don't publish schematics of our products, sorry.

@misterlisty Micropython uses the prefix u for its modules to indicate, that it may be a subset of what you have in CPython. For compatibility, the names without u are also provided. So, the genric name in MicroiPyhton is uos.uname, while os.uname is also possible. Likewise, you can write import uos or import os There are some deviations from that simple rule. Like in CPython, you can use _io, whereas in Micropython it's called uio (not u_io), and _io is not known. Also, why some modules have a non-u alias and others not is unclear. You could change that easily in mpconfigport.h of the respective port.

@misterlisty look here https://forum.pycom.io/topic/518/ota-or-not-ota-that-is-the-question/80

@misterlisty No, in ESP32 there is only built in Wifi and BT. For lora there is another chip SX1272. In lopy4 there is new one SX1276 which support both lora and sigfox. Sources are on the github https://github.com/pycom

If you have a look at our halloween pumpkin project on hackster https://www.hackster.io/user83346052/raw-lora-communication-with-pumpkins-f02630 you can see that you can get a lot more than 2 RGB LEDs working if you need to

Both of these have been rectified. The LoPy4 now actually has both antenna ports and all pinouts now show that 3v3 is output only

All regular pins default to input with pulldown enabled, so you can tie them to ground or leave them unconnected.