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我試圖讓mqtt客戶端收到來自它已訂閱的主題的所有郵件,但它每次收到郵件時都只收到第一個郵件另一個客戶端。問題在於,客戶端應該使用qos 2處理10條消息,而只處理第一條消息。消息以幾毫秒的時間間隔同時發送。我不是經常發送消息。我每分鐘發送10條消息。兩個客戶端都是持久的。我確信這封郵件離開了發佈者,因爲無論何時發送郵件,我都會打印它的有效載荷。我使用的是qos 2,因爲收到的消息會保存到數據庫中,我不想重複。我使用的代理是activemq。所以問題是爲什麼會發生這種情況?Mqtt客戶端無法同時處理多個郵件
from sqlalchemy.ext.automap import automap_base
from sqlalchemy.orm import Session
from sqlalchemy import create_engine
from sqlalchemy import update
from sqlalchemy.ext.automap import generate_relationship
import sqlalchemy
import paho.mqtt.client as mqtt
import time
#Function that define what to do on client conenction
def on_connect(client, userdata, rc):
#Subscribe to all specified topics
mqttc.subscribe(topic='/+/mysignals/sensors/+/')
def on_message(client,userdata,message):
#Get the mysignals member id from the topic
topic_split = message.topic.split('/')
member_id = topic_split[1]
session = Session(engine)
sensor_id = topic_split[4]
patient = session.query(Patient).filter(Patient.mysignalsid==member_id).first()
if message.payload == None:
payload = 0
else:
payload = message.payload
if patient:
current_time = time.time()
if patient.id in pending.keys() and (current_time - pending[patient.id]['time_created']) <= 55:
pending[patient.id]['record'].__dict__[sensor_id] = payload
print time.time()
else:
pending.pop(patient.id,None)
patientdata = PatientData()
patientdata.__dict__[sensor_id] = payload
print patientdata.__dict__[sensor_id]
print payload
print patientdata.temp
patient.patientdata_collection.append(patientdata)
session.add(patientdata)
print time.time()
pending.update({patient.id:{
'time_created':time.time(),
'record':patientdata,
}})
session.flush()
session.commit()
print('Wrote to database.')
pending = {}
Base = automap_base()
engine = create_engine('mysql+mysqlconnector://user:[email protected]/db')
# reflect the tables
Base.prepare(engine, reflect=True)
Patient = Base.classes.patient
PatientData = Base.classes.patientdata
session = Session(engine)
#Create a mqtt client object
mqttc = mqtt.Client(client_id='database_logger',clean_session=False)
#Set mqtt client callbacks
mqttc.on_connect = on_connect
mqttc.on_message = on_message
#Set mqtt broker username and password
mqttc.username_pw_set('blah','blahblah')
#Connect to the mqtt broker with the specified hostname/ip adress
mqttc.connect('127.0.0.1')
mqttc.loop_forever()
輸出繼電器:
98
98
None
1500576377.3
Wrote to database.
1500576377.43
Wrote to database.
輸出應該是:
98
98
None
1500576377.3
Wrote to database.
25.4
25.4
25.4
1500576377.43
Wrote to database.
編輯問題顯示您的代碼 – hardillb
我更新了帖子並添加了我的代碼。 –
首先,你的話題不應該以'/'開頭和結尾,其次你的代碼會得到什麼輸出? – hardillb