init

main.py

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+import time
+from umqttsimple import MQTTClient
+import ubinascii
+import machine
+import micropython
+import network
+import esp
+from machine import Pin
+from utime import sleep_ms
+from neopixel import NeoPixel
+
+
+esp.osdebug(None)
+import gc
+gc.collect()
+
+ssid = 'your_ssid'
+password = 'your_password'
+mqtt_server = 'mqtt_server_ip'
+#EXAMPLE IP ADDRESS
+#mqtt_server = '192.168.1.144'
+client_id = ubinascii.hexlify(machine.unique_id())
+topic_sub = b'notification'
+topic_pub = b'power/power_03/cmnd/Power'
+
+last_message = 0
+message_interval = 5
+counter = 0
+
+button = Pin(14, Pin.IN, Pin.PULL_UP) # D5
+PIXELS = 10
+np = NeoPixel(Pin(12, Pin.OUT), PIXELS) # Pixel on pin 22 (D6), lenght=10
+
+station = network.WLAN(network.STA_IF)
+
+station.active(True)
+station.connect(ssid, password)
+
+while station.isconnected() == False:
+    pass
+
+print('Connection successful')
+print(station.ifconfig())
+
+
+def check_pin():
+    if not button.value():
+        print("Woha! Someone pressed the button!")
+        return(1)
+    else:
+        return(0)
+    
+
+def translate(value, leftMin, leftMax, rightMin, rightMax):
+    '''
+    Translates a value from one range to another.
+    Borrowed from: https://stackoverflow.com/questions/1969240/mapping-a-range-of-values-to-another
+    '''
+    # Figure out how 'wide' each range is
+    leftSpan = leftMax - leftMin
+    rightSpan = rightMax - rightMin
+
+    # Convert the left range into a 0-1 range (float)
+    valueScaled = float(value - leftMin) / float(leftSpan)
+
+    # Convert the 0-1 range into a value in the right range.
+    return int(rightMin + (valueScaled * rightSpan))
+
+
+def sub_cb(topic, msg):
+    print((topic, msg))
+
+
+def connect_and_subscribe():
+    global client_id, mqtt_server, topic_sub
+    client = MQTTClient(client_id, mqtt_server)
+    client.set_callback(sub_cb)
+    client.connect()
+    client.subscribe(topic_sub)
+    print('Connected to %s MQTT broker, subscribed to %s topic' % (mqtt_server, topic_sub))
+    return client
+
+
+def restart_and_reconnect():
+    print('Failed to connect to MQTT broker. Reconnecting...')
+    time.sleep(10)
+    machine.reset()
+
+
+try:
+    client = connect_and_subscribe()
+except OSError as e:
+    restart_and_reconnect()
+
+
+POWERSTATE = False
+WATER_TIME = 120
+START_TIME = time.time()
+client.publish(topic_pub, b'OFF')
+
+while True:
+    try:
+        new_message = client.check_msg()
+        if new_message != 'None':
+        
+            # Check for button push
+            if check_pin():
+                START_TIME = time.time()
+                client.publish(topic_pub, b'ON')
+                POWERSTATE = True
+                sleep_ms(500)
+            
+            # Check if timer has run out
+            if (time.time() - START_TIME) > WATER_TIME:
+                if POWERSTATE:
+                    client.publish(topic_pub, b'OFF')
+                    print("Time is up.!")
+                    POWERSTATE = False
+            
+            #If water is running, show time left on LEDs 
+            if POWERSTATE:
+                for i in range(PIXELS):
+                    np[i] = (0, 0, 0)
+                #time_left = WATER_TIME - (time.time() - START_TIME)
+                i = translate((time.time() - START_TIME), 0, WATER_TIME, 0, PIXELS-1)
+                np[i] = (20,20,20)
+            else:
+                for i in range(PIXELS):
+                    np[i] = (0, 0, 0)
+            np.write()
+
+    except OSError as e:
+        restart_and_reconnect()

umqttsimple.py

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+try:
+    import usocket as socket
+except:
+    import socket
+import ustruct as struct
+from ubinascii import hexlify
+
+class MQTTException(Exception):
+    pass
+
+class MQTTClient:
+
+    def __init__(self, client_id, server, port=0, user=None, password=None, keepalive=0,
+                 ssl=False, ssl_params={}):
+        if port == 0:
+            port = 8883 if ssl else 1883
+        self.client_id = client_id
+        self.sock = None
+        self.server = server
+        self.port = port
+        self.ssl = ssl
+        self.ssl_params = ssl_params
+        self.pid = 0
+        self.cb = None
+        self.user = user
+        self.pswd = password
+        self.keepalive = keepalive
+        self.lw_topic = None
+        self.lw_msg = None
+        self.lw_qos = 0
+        self.lw_retain = False
+
+    def _send_str(self, s):
+        self.sock.write(struct.pack("!H", len(s)))
+        self.sock.write(s)
+
+    def _recv_len(self):
+        n = 0
+        sh = 0
+        while 1:
+            b = self.sock.read(1)[0]
+            n |= (b & 0x7f) << sh
+            if not b & 0x80:
+                return n
+            sh += 7
+
+    def set_callback(self, f):
+        self.cb = f
+
+    def set_last_will(self, topic, msg, retain=False, qos=0):
+        assert 0 <= qos <= 2
+        assert topic
+        self.lw_topic = topic
+        self.lw_msg = msg
+        self.lw_qos = qos
+        self.lw_retain = retain
+
+    def connect(self, clean_session=True):
+        self.sock = socket.socket()
+        addr = socket.getaddrinfo(self.server, self.port)[0][-1]
+        self.sock.connect(addr)
+        if self.ssl:
+            import ussl
+            self.sock = ussl.wrap_socket(self.sock, **self.ssl_params)
+        premsg = bytearray(b"\x10\0\0\0\0\0")
+        msg = bytearray(b"\x04MQTT\x04\x02\0\0")
+
+        sz = 10 + 2 + len(self.client_id)
+        msg[6] = clean_session << 1
+        if self.user is not None:
+            sz += 2 + len(self.user) + 2 + len(self.pswd)
+            msg[6] |= 0xC0
+        if self.keepalive:
+            assert self.keepalive < 65536
+            msg[7] |= self.keepalive >> 8
+            msg[8] |= self.keepalive & 0x00FF
+        if self.lw_topic:
+            sz += 2 + len(self.lw_topic) + 2 + len(self.lw_msg)
+            msg[6] |= 0x4 | (self.lw_qos & 0x1) << 3 | (self.lw_qos & 0x2) << 3
+            msg[6] |= self.lw_retain << 5
+
+        i = 1
+        while sz > 0x7f:
+            premsg[i] = (sz & 0x7f) | 0x80
+            sz >>= 7
+            i += 1
+        premsg[i] = sz
+
+        self.sock.write(premsg, i + 2)
+        self.sock.write(msg)
+        #print(hex(len(msg)), hexlify(msg, ":"))
+        self._send_str(self.client_id)
+        if self.lw_topic:
+            self._send_str(self.lw_topic)
+            self._send_str(self.lw_msg)
+        if self.user is not None:
+            self._send_str(self.user)
+            self._send_str(self.pswd)
+        resp = self.sock.read(4)
+        assert resp[0] == 0x20 and resp[1] == 0x02
+        if resp[3] != 0:
+            raise MQTTException(resp[3])
+        return resp[2] & 1
+
+    def disconnect(self):
+        self.sock.write(b"\xe0\0")
+        self.sock.close()
+
+    def ping(self):
+        self.sock.write(b"\xc0\0")
+
+    def publish(self, topic, msg, retain=False, qos=0):
+        pkt = bytearray(b"\x30\0\0\0")
+        pkt[0] |= qos << 1 | retain
+        sz = 2 + len(topic) + len(msg)
+        if qos > 0:
+            sz += 2
+        assert sz < 2097152
+        i = 1
+        while sz > 0x7f:
+            pkt[i] = (sz & 0x7f) | 0x80
+            sz >>= 7
+            i += 1
+        pkt[i] = sz
+        #print(hex(len(pkt)), hexlify(pkt, ":"))
+        self.sock.write(pkt, i + 1)
+        self._send_str(topic)
+        if qos > 0:
+            self.pid += 1
+            pid = self.pid
+            struct.pack_into("!H", pkt, 0, pid)
+            self.sock.write(pkt, 2)
+        self.sock.write(msg)
+        if qos == 1:
+            while 1:
+                op = self.wait_msg()
+                if op == 0x40:
+                    sz = self.sock.read(1)
+                    assert sz == b"\x02"
+                    rcv_pid = self.sock.read(2)
+                    rcv_pid = rcv_pid[0] << 8 | rcv_pid[1]
+                    if pid == rcv_pid:
+                        return
+        elif qos == 2:
+            assert 0
+
+    def subscribe(self, topic, qos=0):
+        assert self.cb is not None, "Subscribe callback is not set"
+        pkt = bytearray(b"\x82\0\0\0")
+        self.pid += 1
+        struct.pack_into("!BH", pkt, 1, 2 + 2 + len(topic) + 1, self.pid)
+        #print(hex(len(pkt)), hexlify(pkt, ":"))
+        self.sock.write(pkt)
+        self._send_str(topic)
+        self.sock.write(qos.to_bytes(1, "little"))
+        while 1:
+            op = self.wait_msg()
+            if op == 0x90:
+                resp = self.sock.read(4)
+                #print(resp)
+                assert resp[1] == pkt[2] and resp[2] == pkt[3]
+                if resp[3] == 0x80:
+                    raise MQTTException(resp[3])
+                return
+
+    # Wait for a single incoming MQTT message and process it.
+    # Subscribed messages are delivered to a callback previously
+    # set by .set_callback() method. Other (internal) MQTT
+    # messages processed internally.
+    def wait_msg(self):
+        res = self.sock.read(1)
+        self.sock.setblocking(True)
+        if res is None:
+            return None
+        if res == b"":
+            raise OSError(-1)
+        if res == b"\xd0":  # PINGRESP
+            sz = self.sock.read(1)[0]
+            assert sz == 0
+            return None
+        op = res[0]
+        if op & 0xf0 != 0x30:
+            return op
+        sz = self._recv_len()
+        topic_len = self.sock.read(2)
+        topic_len = (topic_len[0] << 8) | topic_len[1]
+        topic = self.sock.read(topic_len)
+        sz -= topic_len + 2
+        if op & 6:
+            pid = self.sock.read(2)
+            pid = pid[0] << 8 | pid[1]
+            sz -= 2
+        msg = self.sock.read(sz)
+        self.cb(topic, msg)
+        if op & 6 == 2:
+            pkt = bytearray(b"\x40\x02\0\0")
+            struct.pack_into("!H", pkt, 2, pid)
+            self.sock.write(pkt)
+        elif op & 6 == 4:
+            assert 0
+
+    # Checks whether a pending message from server is available.
+    # If not, returns immediately with None. Otherwise, does
+    # the same processing as wait_msg.
+    def check_msg(self):
+        self.sock.setblocking(False)
+        return self.wait_msg()