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Merge pull request #80 from BiffoBear/dhcp_error_handling
DHCP state machine error handling
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| # SPDX-FileCopyrightText: 2021 Patrick Van Oosterwijck @ Silicognition LLC | ||
| # | ||
| # SPDX-License-Identifier: MIT | ||
| # | ||
| # This demo was tested with the PoE-FeatherWing, which contains a 24AA02E48 | ||
| # chip to provide a globally unique MAC address, but can also work without | ||
| # this chip for testing purposes by using a hard coded MAC. | ||
| # | ||
| # It also contains a `get_static_file` function that demonstrates how to | ||
| # use a generator to serve large static files without using up too much | ||
| # memory. To avoid having to put extra files in the repo, it just serves | ||
| # `code.py` which isn't very large, but to properly test it, adjust the code | ||
| # to serve an image of several 100 kB to see how it works. | ||
| # | ||
| # There's also an endpoint that demonstrates that `requests` can be used to | ||
| # get data from another socket and serve it. | ||
| # | ||
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| import board | ||
| import busio | ||
| import digitalio | ||
| import neopixel | ||
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| import adafruit_requests as requests | ||
| from adafruit_wsgi.wsgi_app import WSGIApp | ||
| from adafruit_wiznet5k.adafruit_wiznet5k import WIZNET5K | ||
| import adafruit_wiznet5k.adafruit_wiznet5k_socket as socket | ||
| import adafruit_wiznet5k.adafruit_wiznet5k_wsgiserver as server | ||
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| print("Wiznet5k Web Server Test") | ||
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| def get_mac(i2c_obj): | ||
| "Read MAC from 24AA02E48 chip and return it" | ||
| mac_addr = bytearray(6) | ||
| while not i2c_obj.try_lock(): | ||
| pass | ||
| i2c_obj.writeto(0x50, bytearray((0xFA,))) | ||
| i2c_obj.readfrom_into(0x50, mac_addr, start=0, end=6) | ||
| i2c_obj.unlock() | ||
| return mac_addr | ||
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| def get_static_file(filename): | ||
| "Static file generator" | ||
| with open(filename, "rb") as f: | ||
| b = None | ||
| while b is None or len(b) == 2048: | ||
| b = f.read(2048) | ||
| yield b | ||
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| # Status LED | ||
| led = neopixel.NeoPixel(board.NEOPIXEL, 1) | ||
| led.brightness = 0.3 | ||
| led[0] = (255, 0, 0) | ||
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| # Chip Select for PoE-FeatherWing and Adafruit Ethernet FeatherWing | ||
| cs = digitalio.DigitalInOut(board.D10) | ||
| # Chip Select for Particle Ethernet FeatherWing | ||
| # cs = digitalio.DigitalInOut(board.D5) | ||
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| # Initialize SPI bus | ||
| spi_bus = busio.SPI(board.SCK, MOSI=board.MOSI, MISO=board.MISO) | ||
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| try: | ||
| # Initialize the I2C bus to read the MAC | ||
| i2c = busio.I2C(board.SCL, board.SDA) | ||
| # Read the MAC from the 24AA02E48 chip | ||
| mac = get_mac(i2c) | ||
| except (RuntimeError, OSError): | ||
| # Hard coded MAC if there is no 24AA02E48 | ||
| mac = b"\xFE\xED\xDE\xAD\xBE\xEF" | ||
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| # Initialize Ethernet interface with DHCP | ||
| eth = WIZNET5K(spi_bus, cs, mac=mac) | ||
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| # Initialize a requests object with a socket and ethernet interface | ||
| requests.set_socket(socket, eth) | ||
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| # Here we create our application, registering the | ||
| # following functions to be called on specific HTTP GET requests routes | ||
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| web_app = WSGIApp() | ||
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| @web_app.route("/led/<r>/<g>/<b>") | ||
| def led_on(request, r, g, b): # pylint: disable=unused-argument | ||
| print("LED handler") | ||
| led.fill((int(r), int(g), int(b))) | ||
| return ("200 OK", [], ["LED set!"]) | ||
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| @web_app.route("/") | ||
| def root(request): # pylint: disable=unused-argument | ||
| print("Root WSGI handler") | ||
| return ("200 OK", [], ["Root document"]) | ||
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| @web_app.route("/large") | ||
| def large(request): # pylint: disable=unused-argument | ||
| print("Large pattern handler") | ||
| return ("200 OK", [], ["*-.-" * 2000]) | ||
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| @web_app.route("/code") | ||
| def code(request): # pylint: disable=unused-argument | ||
| print("Static file code.py handler") | ||
| return ("200 OK", [], get_static_file("code.py")) | ||
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| @web_app.route("/btc") | ||
| def btc(request): # pylint: disable=unused-argument | ||
| print("BTC handler") | ||
| r = requests.get("http://api.coindesk.com/v1/bpi/currentprice/USD.json") | ||
| result = r.text | ||
| r.close() | ||
| return ("200 OK", [], [result]) | ||
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| # Here we setup our server, passing in our web_app as the application | ||
| server.set_interface(eth) | ||
| wsgiServer = server.WSGIServer(80, application=web_app) | ||
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| print("Open this IP in your browser: ", eth.pretty_ip(eth.ip_address)) | ||
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| # Start the server | ||
| wsgiServer.start() | ||
| led[0] = (0, 0, 255) | ||
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| while True: | ||
| # Our main loop where we have the server poll for incoming requests | ||
| wsgiServer.update_poll() | ||
| # Maintain DHCP lease | ||
| eth.maintain_dhcp_lease() | ||
| # Could do any other background tasks here, like reading sensors |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,3 +1,4 @@ | ||
| # SPDX-FileCopyrightText: 2022 Alec Delaney, for Adafruit Industries | ||
| # | ||
| # SPDX-License-Identifier: Unlicense | ||
| pytest |
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