"""
Microservices available at
	http://www.saltlake71.eu/urpc

Author: massimo.sala.71 AT gmail.com
"""

import network
from time import sleep
from urequests import post

RECORDS_MAX = 30	# fewer Access Points reduce memory consumption, but location will be less precise
# from uRPC 0.97, no authentication required
#AUTH_TOKEN = "Basic ... insert here your access token ..."


def get_access_points(wlan, limit) :
    n = 0
    r = b''
    for ap in wlan.scan() :
        mac = ap[1]
        rssi = ap[3]	# dBm
        if rssi < 0 and rssi > -150 :					# sanity checks
            r += b"%02d" % n + b"%04d" % rssi + mac		# fixed records of 12 bytes
            n += 1
            if n == 100 or n == limit :
                break
    return n, r


wlan = network.WLAN(network.STA_IF)
if not wlan.active() :            # mandatory, sometimes the wifi nic is sleeping
    wlan.active(True)

n_ap, pkt = get_access_points(wlan, RECORDS_MAX)
print("Found", n_ap, "access points")

retries = 10
while retries and not wlan.isconnected() :
	sleep(1)
	print('.', end = '')
print()

if n_ap and wlan.isconnected() :
	# from uRPC 0.97, no authentication required
    #resp = post("http://saltlake71.eu/urpc?function=geoloc", data = pkt, headers = {"Authorization": AUTH_TOKEN})
    resp = post("http://saltlake71.eu/urpc?function=geoloc", data = pkt)
    if resp.status_code == 200 :
        print("Location: accuracy lat long =", resp.text)
    else :
        print("Error", resp.text)