Setting up dash button without Amazon App

setup-dashbutton.py

import requests
import re
import sys

# Initial work from: https://mpetroff.net/2016/07/new-amazon-dash-button-teardown-jk29lp/

h = requests.Session()

BASE_URL = "http://192.168.0.1"

def wait_for_device():
    print("* Long press the dash button until LED light blinks in blue")
    print("* Connect to Wifi with SSID \"Amazon ConfigureMe\"")
    print("* Waiting for connection...")
    while True:
        try:
            r = h.get(BASE_URL, timeout=1)
            if 'Amazon Dash' in r.content:
                break
        except:
            pass
        else:
            break
    print("+ Connected!")
    content = r.content
    serial = re.findall('Serial Number</th>[^/]+>([A-Z0-9_]+)</td', content, re.DOTALL)[0]
    mac = re.findall('MAC Address</th>[^/]+>([A-Z0-9_]+)</td', content, re.DOTALL)[0]
    firmware = re.findall('Firmware</th>[^/]+>([A-Z0-9_]+)</td', content, re.DOTALL)[0]
    battery = re.findall('Battery</th>[^/]+>([A-Z0-9_]+)</td', content, re.DOTALL)[0]

    print("* Serial: %s, MAC: %s, Firmware: %s, Battery: %s" % (serial, mac, firmware, battery))

    return mac

def configure_wifi(ssid, password):
    print("* Configure Dash button to connect to \"%s\"" % ssid)
    # is the ssid in range ?
    r = h.get(BASE_URL, headers={'Content-Type': 'application/json'}, timeout=5)
    amzn_networks = r.json()['amzn_networks']
    found = False
    for amzn_network in amzn_networks:
        if amzn_network['ssid'] == ssid:
            found = True
            break
    if not found:
        print("- SSID %s is not discoverable by Dash button" % ssid)
        return
    print("%s/?amzn_ssid=%s&amzn_pw=%s" % (BASE_URL, ssid, password))
    r = h.get("%s/?amzn_ssid=%s&amzn_pw=%s" % (BASE_URL, ssid, password), timeout=5)
    if r.status_code == 200:
        print("+ Dash button configured!")
        return True


if __name__ == '__main__':
    if len(sys.argv) < 3:
        print("Usage: setup.py WIFI_SSID WIFI_PASSWORD")
        sys.exit(1)
    try:
        wait_for_device()
        configure_wifi(sys.argv[1], sys.argv[2])
    except KeyboardInterrupt:
        print("Bye")

I am on FW version 60019520_EU and it worked.
The problem in my case was that I had to url encode the SSID and password because it contained spaces and special characters.

Note: Don't forget to block internet access for your dash buttons otherwise they will get an OTA update and brick themselves.

Seems like my button is connection to the wireless network but isn't able to acquire a DHCP lease - odd.