Description

Using the GPy from Pycom.io to POST data to a REST API (in this case a Django REST Framework

• Using a Hologram.io SIM

Current project

• Currently using post_json_data project
  • reports uptime and GPS every hour using GPy and Pytack v2.
  • 29-Mar-2022: added option to add Adafruit's bme680 shield to GPy and Pytrack v2, using a breadboard an the SPI interface. Many thanks to robert-hh/BME680-Micropython

Firmware

• Upgrade Pytrack 2 firmware as described at this link
• Upgrade GPy as described at this link, for USB
  • sudo usermod -a -G dialout $USER and reboot
  • Download and install Atom and install Pymakr plugin
  • attach Gpy to Pytrack v2. Connect Pytrack v2 with USB and REPL should be available in Atom
  • Example:

  >>> import sqnsupgrade as ssqn
  >>> ssqn.info()
  <<< Welcome to the SQN3330 firmware updater [1.2.6] >>>
  >>> GPy with firmware version 1.20.2.r2
  Your modem is in application mode. Here is the current version:
  UE5.4.0.2
  LR5.4.1.0-50523
  
  IMEI: xxxxx
  

  • Currently no firmware upgrade is needed as described here
  • If a firmware upgrade is required, then probably do sudo apt install python3-serial and follow link's instructions

References

• Pycom documentation
• The pyboard.py tool
• Useful debugging: see Readme_debugging.md

private_vars.py

See sample_private_vars.py for an example. Used for private (secret) variables. Create a file, `lib/private_vars.py' and use as follows:

import private_vars
server = private_vars.HOST

Commands to be used with pyboard.py as compared to the Atom editor

Sometimes Atom and the Pymakr plugin do not always work, e.g. failed to upload. Resolve these type of issues after downloading [pyboard.py](./pyboard.py simple_files/get_https/main.py) and using the virtual environment (see Pipfile). Some examples are below.

#Cleaning up
./pyboard.py --no-soft-reset -f rm :main.py
rm :main.py

./pyboard.py --no-soft-reset -f ls :
ls :
          29 boot.py
           0 cert/
           0 lib/
          34 main.py
           0 sys/

#Default main.py
./pyboard.py -f cat :main.py
cat :main.py
# main.py -- put your code here!

#Run this script in memory
./pyboard.py simple_files/hello_world/main.py
Hello!
Hello!

#Run this project in memory after loading libraries
./pyboard.py -f cp projects/hello_world/lib/helper_functions.py :lib/
cp projects/hello_world/lib/helper_functions.py :lib/helper_functions.py

./pyboard.py -f cat :lib/helper_functions.py
cat :lib/helper_functions.py
import private_vars

def hello_world():
    return '{}'.format(private_vars.msg)

./pyboard.py projects/hello_world/main.py
Starting "Hello World Project"
msg: Goodnight Moon!
msg: Goodnight Moon!
msg: Goodnight Moon!

#Another example of testing a script before uploading it
./pyboard.py simple_files/get_https/main.py

Serial connections.

In addition to the pyboard.py tool (above), one can enter the REPL with a serial connection

For example:

screen /dev/ttyACM0 115200
#or,
screen /dev/ttyACM0 115200 -hupc

#Or, starting with pyboard
./pyboard.py --no-exclusive simple_files/hello_world/main.py
#then, Ctrl-C, exiting, and then to follow the output
screen /dev/ttyACM0 115200 -hupc
#and to drop to a python prompt: Ctrl-C Ctrl-B
>>>
>>> help()

#Note: Ctrl-F will dump everything and restart the program, the Ctrl-C

screen logging

#https://fvdm.com/code/howto-write-screen-output-to-a-log-file
screen -dmS test -L /dev/ttyACM0 115200
screen -S test -X colon "logfile flush 0^M"
tail -Fn 0 screenlog.0
#or reattach to screen
screen -r test

See related sketch

• Arduino related sketches MKRGSM1400 (public)