Base project

main.py

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+import time
+import network
+import socket
+import ubinascii
+from machine import Pin, I2C
+
+import micropython_mcp9808.mcp9808 as mcp9808
+from secrets import secrets
+
+GET_PATH_START = 4
+POST_PATH_START = 5
+
+led = Pin('LED', Pin.OUT)
+def blink_onboard_led(num_blinks):
+    for i in range(num_blinks):
+        led.value(1)
+        time.sleep_ms(200)
+        led.value(0)
+        time.sleep_ms(200)
+blink_onboard_led(1)
+
+sdaPIN=Pin(20)
+sclPIN=Pin(21)
+i2c=I2C(0,sda=sdaPIN, scl=sclPIN, freq=200000)
+devices = i2c.scan()
+if len(devices) != 0:
+    print('Number of I2C devices found=',len(devices))
+    for device in devices:
+        print("Device Hexadecimel Address=",hex(device))
+else:
+    print("No device found")
+
+mcp9808 = mcp9808.MCP9808(i2c)
+
+
+ssid = secrets['ssid']
+password = secrets['pw']
+
+wlan = network.WLAN(network.STA_IF)
+wlan.active(True)
+wlan.connect(ssid, password)
+
+max_wait = 10
+while max_wait > 0:
+    if wlan.status() < 0 or wlan.status() >= 3:
+        break
+    max_wait -= 1
+    print('waiting for connection...')
+    time.sleep(1)
+
+ip = "???"
+if wlan.status() != 3:
+    blink_onboard_led(3)
+    raise RuntimeError('network connection failed')
+else:
+    print('connected')
+    status = wlan.ifconfig()
+    ip = status[0]
+    print( 'ip = ' + ip )
+
+wlan_mac = wlan.config('mac')
+mac_readable = ubinascii.hexlify(wlan_mac).decode()
+
+blink_onboard_led(2)
+
+addr = socket.getaddrinfo('0.0.0.0', 80)[0][-1]
+
+s = socket.socket()
+s.bind(addr)
+s.listen(1)
+
+print('listening on', addr)
+
+def result_ok(cl, response = None, content_type = "text/plain"):
+    cl.send('HTTP/1.0 200 OK\r\nContent-type: ' + content_type + '\r\n\r\n')
+    cl.send(response if response is not None else "Ok")
+    cl.close()
+
+def result_notfound(cl, response = None):
+    cl.send('HTTP/1.0 404 NotFound\r\nContent-type: text/plain\r\n\r\n')
+    cl.send(response if response is not None else "Not Found")
+    cl.close()
+
+while True:
+
+    cl, addr = s.accept()
+    try:
+        print('client connected from', addr)
+        request = cl.recv(1024)
+
+        request = str(request)
+        request = request[2:-1] # remove b' and ' from string
+        print(request)
+
+        if request.find('/ ') == GET_PATH_START:
+            temp = str(mcp9808.temperature)
+            result_ok(cl, "{ \"temperature\": \"" + temp + "\" }", 'application/json')
+
+        elif request.find('/prometheus') == GET_PATH_START:
+            temp = str(mcp9808.temperature)
+            content = """# HELP temperature Temperature in Celsius
+# TYPE temperature gauge
+temperature{mac=\"""" + mac_readable + "\",ip=\""+ ip +"\"} " + temp
+            result_ok(cl, content)
+        else:
+            result_notfound(cl)
+
+
+    except OSError as e:
+        cl.close()
+        print('connection closed')