python uses MQTT to transfer pictures to hardware

Task Brief Recently, we need to write a microservice with Python to transmit pictures to hardware with MQTT. Among them, python uses the flash framework, and the general process is as follows: The agreement is: The picture data needs to be encapsulated into multiple messages for transmission, and the number of data bytes t ...

Posted on Sun, 17 Nov 2019 07:16:24 -0800 by tina88

I2C bus reads MPU6050

Article directory Experimental purpose Experimental steps experimental analysis Source code analysis Main function I2C initialization I2C_Write_Byte IIC_Start IIC_SendByte GetMPU6050Offset GetMPU6050Data Mpu6050manager U T structure Experimental purpose Reading MPU6050 sensor data by I2C bus based on MSP430 processor ...

Posted on Sun, 17 Nov 2019 07:08:06 -0800 by gregsmith

Learn JAVA day 23, List type and Set type

Array is the most commonly used, but sometimes, we need to use array, but we do not know the length of the array class, We have a very useful tool Collection in java, which is the care of java's father. The Collection includes List and Set And Map, but today the teacher talked about list and set. List is an ordered generic array. Set is an un ...

Posted on Sun, 17 Nov 2019 06:50:54 -0800 by ScubaDvr2

Learn Python in minutes - Chapter 4 file operation

Chapter IV document operation 4.1 basic operation of documents obj = open('Route',mode='Pattern',encoding='Code') obj.write() # Write in obj.read() # read obj.close() #Close 4.2 open mode r / w / a [read only string]* r+ / w+ / a + [readable and writable string] rb / wb / ab* r+b / w+b / a+b 4.3 operation read(), all read to memory read ...

Posted on Sun, 17 Nov 2019 06:30:51 -0800 by nodster

Talk about the adjustThreadPoolNumsThreshold of rocketmq

order This paper mainly studies the adjustThreadPoolNumsThreshold of rocketmq DefaultMQPushConsumer rocketmq-client-4.5.2-sources.jar!/org/apache/rocketmq/client/consumer/DefaultMQPushConsumer.java public class DefaultMQPushConsumer extends ClientConfig implements MQPushConsumer { private final InternalLogger log = ClientLogger.getLog(); ...

Posted on Sun, 17 Nov 2019 06:28:27 -0800 by Whitestripes9805

c. extended method learning notes

The simple understanding of C extension method is to add a method for a class without modifying the source code of the original class. Extension methods are defined as static methods, but they are called through the instance method syntax. Their first parameter specifies which type the method acts on, and it is prefixed with the this modifier. ...

Posted on Sun, 17 Nov 2019 06:22:34 -0800 by jayjay960

Python Language Base 06-Strings and Common Data Structures

This article is included in Python Getting Started to Master Series of Articles 1. Use strings World War II led to the birth of modern electronic computers, which were originally used to calculate missile trajectories. For many years after the birth of computers, information processed by computers was essentially numeric.The world's first compu ...

Posted on Sun, 17 Nov 2019 05:46:57 -0800 by rhiza

BGP EVPN RD and RTS

When FRR learns a local VNI configuration, it automatically derives RD and RTS (including import and export) for the VNI if the user does not display RD and RT for the VNI.The derivation rules are as follows: RD format is "Type:Routerid:VNI-Index" RT format is "AS:VNI" RD and RT are used for EVPN routing switching.RD is used ...

Posted on Sun, 17 Nov 2019 05:09:24 -0800 by Smicks

PHP String Type Conversion from Source View

Type conversion of PHP is more convenient, but the easier it is to use, the more complex the underlying implementation is, and novices like me often don't know what the result is after conversion.Sometimes, for a strongly typed language like Java, you need to force a conversion when you use it, so that most of the results are predictable, at le ...

Posted on Sun, 17 Nov 2019 04:49:44 -0800 by btrsrinivasarao

supervisor + pins for on-line warning

1. Background introduction In order to ensure the stability of the online project, the supervisor needs to re-start the process after the failure several times, so that the relevant technicians can handle it in time.The results are as follows: 2. Basic knowledge Here's a literacy cleanup for readers who have never been exposed to supervisor s o ...

Posted on Sat, 16 Nov 2019 20:03:39 -0800 by jonners