"""
# Establish PPP on ESP32 using SIM7608E.
"""

import time
from network import PPP
from machine import UART, Pin
import socket
import ssl

quiet = False
# Set APN. Specific to your  cellular carrier.
apn = "internet.telekom"
baud_rate = 115200

# Create UART object for SIM76xx modem. Start with 115200 baud.
uart = UART(1, baudrate=115200, rxbuf=1024, txbuf=1024, timeout=200, timeout_char=200)

def wait_response(port, response):
    port.flush()
    resp_msg = None
    while msg := port.readline():
        if not quiet:
            print(msg)
        if response and msg.startswith(response):
            resp_msg = msg
    return resp_msg

def get_http_page(url):
    s = socket.socket()
    try:
        i = socket.getaddrinfo(url, 80)[0][-1]
        print('Connecting to socket...')
        print(s.connect(i))
        print('Send...')
        print(s.send(b"GET / HTTP/1.0\r\n\r\n"))
        print("Get...")
        print(s.recv(4096))
    except:
        print("Connect & xchange failed")
    print('Close socket...')
    s.close()

# Ping modem until it is on and ready
timeout = 10
while timeout > 0:
    uart.write('AT\r\n')
    resp = wait_response(uart, b'AT')
    if resp:
        break
    print(".", end="")
    time.sleep(2)
    timeout -= 1
else:
    print("Unable to establish connection with modem. Try the above again, or potentially check that the pinout is correct")
    raise Exception("Modem unavailable")

uart.write('AT+SIMCOMATI\r\n')
wait_response(uart, None)

uart.write('AT+CEREG=0\r\n')
wait_response(uart, None)

# Wait for registration, which may take a while
timeout = 120
while timeout > 0:
    uart.write('AT+CEREG?\r\n')
    resp = wait_response(uart, b"+CEREG")
    # Wait for "+CEREG=0,1"
    if resp and resp.strip().split(b',')[1] == b"1":
        break
    time.sleep_ms(1000)
    timeout -= 1
else:
    print("Cannot register to the network")
    raise Exception("Network unavailable")

# disable unsolicited messaged
uart.write('AT+CGEREP=0\r\n')
wait_response(uart, None)

# switch the baud rate
if baud_rate != 115200:
    uart.write('AT+IPR={}\r\n'.format(baud_rate))
    wait_response(uart, None)
    uart.init(baudrate=baud_rate, rxbuf=1024, txbuf=1024)

# Connect to network and establish PPP
uart.write('AT+CGDCONT=1,"IP","{}"\r\n'.format(apn))
wait_response(uart, None)
# Enable PPP
uart.write('ATD*99#\r\n')
resp = wait_response(uart, b"CONNECT")

if resp:
    # Hand modem object off to system PPP module
    ppp = PPP(uart)
    # GPRS.active(True)
    resp = ppp.connect(security=PPP.SEC_PAP, user="t-mobile", key="tm")
    # This will print out your IP, subnet, gateway, and dns
    print(ppp.ifconfig())
    # Check that you can use a socket
    addr = socket.getaddrinfo('micropython.org', 80)[0][-1]
    print(addr)
    get_http_page('micropython.org')
    #disconnect
    ppp.disconnect()

# stop session
print("Stop PPP session")
uart.write('+++')
wait_response(uart, None)
uart.write('ATH\r\n')
resp = wait_response(uart, None)
# Switch the baud rate back if needed
if baud_rate != 115200:
    uart.write('AT+IPR=115200\r\n')
    wait_response(uart, None)

# Reset the modem to clear the internal states.
# That fixes the non-connect on the second call.
# uart.write('AT+CRESET\r\n')
# wait_response(uart, None)

print("Test finished")