I don't use the GPy for sending whole files, but basically as a device to send data in real time every few minutes. I have an Arduino connected to a GPy via serial. The Arduino sends data strings to the GPy. The GPy sends the data to my database at the end. I have to tell you though, that sending data via LTE-M didn't work reliably for me till I took some certain measures. Problem 1: The GPy consistently stopped working for me after a short while (every few days), because of Guru Meditation Errors, where the GPy often completely froze. It just couldn't recover by itself. That's why I've used my Arduino also as an external Watchdog, resetting the GPy with the Arduino. These Guru Meditation Errors seem to come up pretty often while using it to transmit data (LTE-M). Problem 2: Sometimes the GPy also thinks it has a data connection, while it is not the case. Using the Reset pin on the GPy doesn't help in this case. That's why I also had to implement a P-Channel Mosfet, which cuts the power off from the GPy. This power cycle helps with the problem in my experience. The features of Pycom hardware are wonderful, if you are interested in getting your data onto a server, but you have to take some measures to make it work reliably. I wish you good luck with your project!

@jack-austin This is the wrong forum for Raspberry Pi Pico and MicroPython. Better go to https://forum.micropython.org/

@Gijs Hello! that pin are not needed, infact my code is working, one hardware pin "p2" had some issue, it is constant 3.3V which means that the ploadPin are not toggled. The code awill hopefully be uploaded on Git!

@Dezert754 You have to connect the GND of both devices and a Pin of the Wipy set as Output to a Pin of the Arduino set as Input. The cables should not be long, and adding a resistor of 4.7kOhm into the wire does not hurt. Since the WiPy runs at 3.3 V and the Arduino at 5V, the level at the Arduino for a high is specified as 3.5V, so it's not sure if it works. Better use a level converter.

@rcolistete Thanks for the links. Thats a great start, and already has helped me in the implementation of one of my components. As a noob to Pycom, it really has taken longer than it should have to acquaint myself with where to find information, drivers, tutorials, and examples for Pycom. For instance, the links you provided are very useful, but for a newcomer they are very much in the woodworks, and I still think everything is too scattered. Some consolidation would be greatly appreciated. Even a pinned getting started page with links would be a start. Through comparing a few Pycom libraries that were adapted from Micropython libraries I have gotten the hang of how to convert over libraries. If there was a good centralized place to post Pycom libraries I would be happy to share my adaptations and the libraries I've created for some components that don't have libraries out there at all. A tutorial, for converting libraries would still be great, thanks @Paul-Thornton for your consideration.

@zahary-momchilov Yes. You can use WiFi. However it is advisable to have a generic USB/UART adapter with 3.3v output as second option. Any adapter with 3.3V output level will do. The latter sorts out most Arduinos.

Hey @jcaron, thanks for your response. A picture is about 10-20KB in size but the Arduino can provide the data in small chunks, say 256 bytes or 64 bytes (whatever data packet size the GPy is comfortable with). As for support by the carrier, is there a good way to find out if the city I live in (Vancouver, Canada) supports LTE CAT-M1 and NB-IoT?

I'm getting this error whenever I try to compile anything for the GPy: [15975] Error loading Python lib '/var/folders/57/hyd6ntr1233_x_brscxdp8480000gn/T/_MEI7xbrkg/libpython3.8.dylib': dlopen: dlopen(/var/folders/57/hyd6ntr1233_x_brscxdp8480000gn/T/_MEI7xbrkg/libpython3.8.dylib, 10): Symbol not found: ____chkstk_darwin Referenced from: /var/folders/57/hyd6ntr1233_x_brscxdp8480000gn/T/_MEI7xbrkg/libintl.8.dylib Expected in: /usr/lib/libSystem.B.dylib in /var/folders/57/hyd6ntr1233_x_brscxdp8480000gn/T/_MEI7xbrkg/libintl.8.dylib I have just re-installed Python 3.9. Anyone know how to fix this?

@catalin This is a promotion for NCD store, camouflaged as a question. See https://goo.gl/J9jZ6U for a list of similar questions. And see the user's profile, everything they've posted contains a link to the NCD store. https://forum.pycom.io/user/jhonrob92?_=1533136634032&loggedin=true

@seb thankyou so much 😉

@helalbr You can use a serial connection via UART in combination, to be safe, with level shifters, which are widely available, e.g. from adafruit. Since you only need to send from the Lopy to the Arduino, only the connections TX(Lopy) to RX(Arduino) and GND to GND are required.

Hi @river, this is a interesting idea, maybe, Did you get to burn esp32-arduino firmware?

@maelstrom Hello, LoRaRAW works for me between 2 LoPys both on EUR and US frequencies on the latest firmware, all the other parameters are default values.

To enable reception you need to put your p_out to FALSE.

@livius Many thanks i'm waiting to receive the first lot of FiPy and start the NB-IOT journey

@robert-hh Thanks a lot Robert and Livius! I saw indeed the PWM example in the Micropython docs to dim a led.

@PiAir Thank you for sharing this

@jcleloup Yes, correct. The SiPy is not just a modem, it's also microcontroller and many times more powerful than the Arduino