NETWORK.md

Networking

This allows the watch to make web requests.

This is still in early development, so there may be bugs.

Example

In this example, when the app is called to the foreground, it calls the function _fetch. _fetch formats the parameters (url, method, class), and sends it to the phone using _send_cmd. When the phone gets a response from the Internet, it calls the _network function with a boolean success and a string response.

import wasp

class NetworkApp():
    """An app to show how to use networking with the wasp-os companion app"""
    NAME = "Network"

    def __init__(self):
        self.msg = "Loading..."

    def foreground(self):
        self._draw()
        self.msg = "Loading..."
        self._fetch("https://jsonplaceholder.typicode.com/albums/1", "get", "NetworkApp")

    def _draw(self):
        draw = wasp.watch.drawable
        draw.fill()
        chunks = draw.wrap(self.msg, 240)
        for i in range(len(chunks)-1):
            sub = self.msg[chunks[i]:chunks[i+1]].rstrip()
            draw.string(sub, 0, 24*i)

    def _network(self, success, response):
        if success:
            self.msg = response
        else:
            self.msg = "There was an error!"
        self._draw()

    def _fetch(self, url, method, app):
        cmd = '{"t": "fetch", "m": "'+method+'", "u": "'+url+'", "a": "'+app+'"}'
        self._send_cmd(cmd)

    def _send_cmd(self, cmd):
        print('\r')
        for i in range(1):
            for i in range(0, len(cmd), 20):
                print(cmd[i: i + 20], end='')
                time.sleep(0.2)
            print(' ')
        print(' ')