Android和硬件通信使用的Modbus库 react-native-modbus

原生库 使用的是 志勇大神封装的Modbus库 [项目地址]:[https://github.com/licheedev/Modbus4Android]

开始使用

$ npm install react-native-modbus --save

自动链接原生库

$ react-native link react-native-modbus

1. 在Android 目录下 的build.gradle文件里面的 repositories 增加 maven { url 'https://jitpack.io' } 如下

    allprojects {
    repositories {
        mavenLocal()
        google()
        jcenter()
        maven {
            // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
            url "$rootDir/../node_modules/react-native/android"
            }
      maven { url 'https://jitpack.io' }
      }
    }

2. 在AndraidMainifest.xml 文件中 将 android:allowBackup="false" 改成android:allowBackup="true"

3. 注意这个库支持的miniSDK 是18

手动安装

Android

1. Open up android/app/src/main/java/[...]/MainActivity.java

• Add import com.reactlibrary.RNModbusPackage; to the imports at the top of the file
• Add new RNModbusPackage() to the list returned by the getPackages() method

2. Append the following lines to android/settings.gradle:

   include ':react-native-modbus'
   project(':react-native-modbus').projectDir = new File(rootProject.projectDir, 	'../node_modules/react-native-modbus/android')

3. Insert the following lines inside the dependencies block in android/app/build.gradle:

     compile project(':react-native-modbus')

使用方法如下 或者参考example里面的app.js文件

import RNModbus from 'react-native-modbus';

// TODO: What to do with the module?
RNModbus;


/**
 * 打开串口
 * @param {*串口编程口} path 
 * @param {*波特率} baudrate 
 * @param {*数据位} dataBits 
 * @param {*校验位} parity 
 * @param {*停止位} stopBits 0 (NONE), 1 (ODD), 2 (EVEN)
 */
function openDevice(path, baudrate, dataBits, parity, stopBits) {
    RNModbus.openDevice(path, baudrate, dataBits, parity, stopBits);
}

/**
 * 写寄存器
 * @param {*从机地址} slaveId 
 * @param {*写入的地址} start 
 * @param {*写入的值} values 
 * @param {*写入成功或者失败回调} Callback 
 */
function writeRegisters(slaveId, start, values) {
    RNModbus.writeRegisters(slaveId, start, values)
}

/**
 * 写单个寄存器
 * @param {* 从机地址} slaveId 
 * @param {* 寄存器地址} start 
 * @param {* 写入的值} value 
 * @param {* 回调} Callback 
 */
function writeSingleRegister(slaveId, start, value) {
    RNModbus.writeRegisters(slaveId, start, value);
}

/**
 * 读寄存器数据
 * @param {*从机地址} slaveId 
 * @param {*读取的寄存器地址} start 
 * @param {*读取的长度} len 
 * @param {*读取的回调} Callback 
 */
function readHoldingRegisters(slaveId, start, len) {
    RNModbus.readHoldingRegisters(slaveId, start, len)
}