rf95modem go

RF95MODEM-GO

Golang库通过串行连接到RF95MODEM，通过Lora Phy发送和接收数据。

该库进行了针对RF95Modem Commit 8f163aa测试，此后版本为0.7.3。

图书馆

该库的主要重点是在RF95Modem的帮助下通过Lora的物理层Lora Phy发送和接收数据。

因此， rf95.Modem允许与连接的RF95MODEM直接交互，包括配置更改，发送和接收RAW LORA PHY消息。此外， rf95.Stream允许使用已知的io.Reader和io.Writer接口进行数据交换。 rf95.Stream被连接到rf95.Modem作为注册处理程序，当然，也可以实现和连接自定义处理程序。

以下两个简短的代码示例演示了如何在顶部使用rf95.Modem和rf95.Stream 。文档中提供了更多详细信息。在./cmd下也有示例程序，下面还描述了这些程序。

 // Example of how to use a rf95.Modem to establish a connection, configure the
// rf95modem, send some bytes and wait for the first answere.

package main

import (
	"context"
	"fmt"

	"github.com/dtn7/rf95modem-go/rf95"
)

func checkError ( err error ) {
	if err != nil {
		panic ( err )
	}
}

func main () {
	// Create and configure a rf95.Modem for rf95modem usage
	modem , err := rf95 . OpenSerial ( "/dev/ttyUSB0" , context . Background ())
	checkError ( err )

	checkError ( modem . Frequency ( 868.23 ))
	checkError ( modem . Mode ( rf95 . FastShortRange ))

	// Broadcast a message
	_ , err = modem . Transmit ([] byte ( "Hello LoRa PHY from rf95modem{,-go}" ))
	checkError ( err )

	// Register a handler to print a received message and exit
	finChan := make ( chan struct {})

	_ , err = modem . RegisterHandlers ( func ( rx rf95. RxMessage ) {
		fmt . Printf ( "%#v n " , rx )
		close ( finChan )
	}, nil )
	checkError ( err )

	<- finChan

	checkError ( modem . Close ())
}

 // Another example which utilizes a rf95.Stream to send a local files and dump a
// received sample to another file.
package main

import (
	"context"
	"fmt"
	"io"
	"os"

	"github.com/dtn7/rf95modem-go/rf95"
)

func checkError ( err error ) {
	if err != nil {
		panic ( err )
	}
}

func main () {
	// Create and configure a rf95.Modem for rf95modem usage
	modem , err := rf95 . OpenSerial ( "/dev/ttyUSB0" , context . Background ())
	checkError ( err )

	checkError ( modem . Frequency ( 868.23 ))
	checkError ( modem . Mode ( rf95 . FastShortRange ))

	// Create a rf95.Stream using our modem
	stream , err := rf95 . NewStream ( modem )
	checkError ( err )

	// Send part of our source code over LoRa, because we are so Free(tm)
	fOut , err := os . Open ( "rf95/modem.go" )
	checkError ( err )
	defer fOut . Close ()

	n , err := io . Copy ( stream , fOut )
	checkError ( err )
	fmt . Printf ( "send %d bytes over LoRa n " , n )

	// Dump 256 bytes received via LoRa to a tempfile
	fIn , err := os . CreateTemp ( "" , "lora_dump_" )
	checkError ( err )
	defer fIn . Close ()

	n , err = io . Copy ( fIn , io . LimitReader ( stream , 256 ))
	checkError ( err )
	fmt . Printf ( "wrote %d bytes received over LoRa to %s n " , n , fIn . Name ())

	checkError ( modem . Close ())
}

示例：RF95LOGGER

一个简单的Logger脚本，用于带有RSSI和SNR的传入消息。

 $ go build ./cmd/rf95logger

 # Logging messages from /dev/ttyUSB0 at 868.1 MHz on mode 1, fast+short range
$ ./rf95logger /dev/ttyUSB0 868.1 1 | tee loralog.csv

示例：rf95pty

一个小概念证明是rf95pty ，将RF95MODEM绑定到新的伪手机设备。该代码应适用于POSIX操作系统。

 $ go build ./cmd/rf95pty

 # Node A provides a shell over LoRa - stupid idea, btw

$ ./rf95pty /dev/ttyUSB0
Starting modem with Status(...)
Opening pty device /dev/pts/5

$ socat /dev/pts/5,raw,nonblock,echo=0 exec:sh,pty,stderr,setsid,sigint,sane

 # Node B uses this shell

$ ./rf95pty /dev/ttyUSB1
Starting modem with Status(...)
Opening pty device /dev/pts/7

$ screen /dev/pts/7