Initial code commit

.gitignore

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+# IDE / editor files
+.idea/
+.vscode/
+.*.swp
+
+# General
+/_tmp
+
+# Python
+__pycache__
+*.py[cod]
+/venv

src/boot.py

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+# boot.py -- run on boot-up
+
+import network
+import pycom
+
+from config import Config
+import wlan_manager
+
+# Disable Pybytes and smart configuration
+pycom.pybytes_on_boot(False)
+pycom.smart_config_on_boot(False)
+
+# Load config from flash memory
+config = Config()
+config.load()
+
+# Enable or disable heartbeat
+pycom.heartbeat(config.get('heartbeat'))
+
+# Reconfigure FTP and Telnet server
+server = network.Server()
+server.deinit()
+server.init(login=(config.get('login_user'), config.get('login_password')), timeout=600)
+
+# Connect to WLAN
+wlan_manager.connect(config)

src/lib/config.py

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+import ujson
+
+CONFIG_FILENAME = '/flash/config.json'
+
+
+class Config:
+    def __init__(self):
+        # Define default config
+        self._config = {
+            'login_user': 'micro',
+            'login_password': 'python',
+            'heartbeat': True,
+            'wlan_config': {},
+        }
+
+    # Load config from JSON file on flash memory
+    def load(self) -> None:
+        try:
+            with open(CONFIG_FILENAME, 'r') as config_file:
+                self._config.update(ujson.load(config_file))
+        except Exception:
+            # Use default config
+            pass
+
+    # Save config as JSON file to flash memory
+    def save(self) -> None:
+        with open(CONFIG_FILENAME, 'w') as config_file:
+            config_file.write(ujson.dumps(self._config))
+
+    def get(self, key: str):
+        return self._config[key]
+
+    def set(self, **kwargs) -> None:
+        self._config.update(kwargs)

src/lib/wlan_manager.py

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+from network import WLAN
+import time
+
+from config import Config
+
+default_wlan_config = {
+    'ssid': '',
+    'wpa2_key': '',
+    'ip_address': '',
+    'ip_subnet': '',
+    'ip_gateway': '',
+    'ip_nameserver': '',
+}
+
+def connect(config: Config) -> WLAN:
+    wlan_config = default_wlan_config.copy()
+    wlan_config.update(config.get('wlan_config'))
+
+    wlan = WLAN(mode=WLAN.STA)
+    wlan.connect(
+        ssid=wlan_config['ssid'],
+        auth=(WLAN.WPA2, wlan_config['wpa2_key']),
+        timeout=10000,
+    )
+
+    print('[wlan_manager] Connecting to WLAN "{}" '.format(wlan_config['ssid']), end='')
+    while not wlan.isconnected():
+        print('.', end='')
+        time.sleep(1)
+    print('\n[wlan_manager] Connected!')
+
+    wlan.ifconfig(config=(
+        wlan_config['ip_address'],
+        wlan_config['ip_subnet'],
+        wlan_config['ip_gateway'],
+        wlan_config['ip_nameserver'],
+    ))
+    print('[wlan_manager] IP config: {}'.format(wlan.ifconfig()))
+
+    return wlan

src/main.py

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+# main.py -- run after boot.py
+
+import _thread
+import time
+
+
+def count(name: str, stop: int = 10):
+    i = 0
+
+    while True:
+        print("[{}] {}".format(name, i))
+        i += 1
+
+        if i > stop:
+            break
+
+        time.sleep(1)
+
+    print("[{}] exit".format(name))
+
+# Start some threads
+_thread.start_new_thread(count, ('thread1', 5))
+_thread.start_new_thread(count, ('thread2', 3))
+
+# Main thread
+count('main', 10)