Initial Code

[brentru]

Adafruit CircuitPython FONA library.

Notes:
This library is currently designed to implement a subset of the SIM800 module commands. It does not implement SMS, phone (calling) or audio commands at this time.

The code in this pull request is not tested with Adafruit CircuitPython IoT libraries such as MiniMQTT and Requests.

• adafruit_fona
  • Implementation of a subset of the SIM800-series at-commands used for cellular data: GPRS, GPS, rssi, iemi, local_ip.
  • TCP/IP, UDP, supports up to six connections (https://cdn-shop.adafruit.com/product-files/2637/SIM800+Series_TCPIP_Application+Note_V1.01.pdf), UDP
• adafruit_fona_socket
  • CPython socket like module.

Tested against Adafruit FONA 808 Breakout, TING SIM card and network.
Adafruit CircuitPython 5.0.0 on 2020-03-02; Adafruit Metro M4 Express with samd51j19

Auto-reload is on. Simply save files over USB to run them or enter REPL to disable.
code.py output:
Adafruit FONA WebClient Test
trying GNS...
Waiting for GPS fix, retrying...
Not registered to a network, waiting...
Local IP:  SNIP!
Connecting to:  wifitest.adafruit.com
Connected to: "104.236.193.178"
bytes_avail:  315
HTTP/1.1 200 OK
Server: nginx/1.10.3 (Ubuntu)
Date: Fri, 17 Apr 2020 22:31:51 GMT
Content-Type: text/html
Content-Length: 70
Last-Modified: Thu, 16 May 2019 18:21:16 GMT
Connection: keep-alive
ETag: "5cddaa1c-46"
Accept-Ranges: bytes

This is a test of Adafruit WiFi!
If you can read this, its working :)

Socket connected:  False

[ladyada]

example is missing '\r' in the HTTP commands but its just a holding example for now so approving while you get requests going (which will fix the issue)