参考: https://blog.csdn.net/freemote/article/details/105348959 环境: micropython ESP32-C3 腾讯云物联网IOT 说明: esp32-c3的固件中 没有umqtt因此，需要手动引入模块simple.py(参考https://github.com/micropython/micropython-lib/blob/master/micropython/umqtt.simple/umqtt/simple.py) 可以使用 help(‘modules’) 查看 剩下的直接代码 simple.py
import usocket as 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) rcvpid = 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()
main.py
# main.py
import time
from umqttsimple import MQTTClient
from gc import mem_free
import network
def connect_wifi(ssid, passwd):
global wlan
wlan = network.WLAN(network.STA_IF) # create a wlan object
wlan.active(True) # Activate the network interface
wlan.disconnect() # Disconnect the last connected WiFi
wlan.connect(ssid, passwd) # connect wifi
while (wlan.ifconfig()[0] == '0.0.0.0'):
time.sleep(1)
wlan_info = wlan.ifconfig()
print("Wifi is connected with the following information:")
print(" IP address : " + wlan_info[0])
print("Subnet mask : " + wlan_info[1])
print(" Gateway : " + wlan_info[2])
print(" DNS : " + wlan_info[3])
mqtt_client = None
def sub_cb(topic, msg):
print("接收到数据", (topic, msg))
mymessage = '{"AAAA": %d }' % (time.time())
print("mqtt_client 1: %s" % mqtt_client.client_id)
mqtt_client.publish(topic=publish_topic, msg=mymessage, retain=True, qos=1)
mqtt_client.publish(topic=publish_topic, msg='13244654', retain=True, qos=1)
print("发送消息", mymessage)
broker_address = 'product_id.iotcloud.tencentdevices.com' # MQTT服务器地址
broker_port = '1883' # MQTT服务器端口
client_id = 'XXXXXX' # MQTT设备id
user_name = 'XXXXXXXXXXXXXX' # mqtt 设备用户名
password = 'XXXXXXXXXXXXXXXXXXXXXXX' # mqtt 设备密码
publish_topic = 'LGSODS81VJ/ESP32Devcice1/data' # 推送主题
subscribe_topic = 'LGSODS81VJ/ESP32Devcice1/data' # 订阅主题
SSID = 'WLAN_NAME' # 无线网名称
PASSWORD = 'WLAN_PASSWORD' #无线网密码
if __name__ == '__main__':
try:
print("\n可用内存1: %s Byte" % str(mem_free()))
connect_wifi(SSID, PASSWORD)
print("\n可用内存2: %s Byte" % str(mem_free()))
mqtt_client = MQTTClient(client_id=client_id, server=broker_address, port=broker_port, user=user_name,
password=password, keepalive=60)
mqtt_client.set_callback(sub_cb)
mqtt_client.connect()
mqtt_client.subscribe(subscribe_topic)
mqtt_client.publish(topic=publish_topic, msg="12345678900000", retain=False, qos=1)
print("mqtt_client 1: %s" % mqtt_client.client_id)
while True:
mqtt_client.wait_msg() # wait message
except Exception as ex_results:
print('exception1', ex_results)
finally:
if (mqtt_client is not None):
mqtt_client.disconnect()
wlan.disconnect()
wlan.active(False)
我这边使用的是腾讯云物联网通讯(使用设备发送消息 最好使用和格式 字符串可能无法接收) 