使用STM32通过LoRaWAN发送消息
我如何通过LoRaWAN发送消息使用STM32通过LoRaWAN发送消息,stm32,lora,lorawan,stm32ldiscovery,Stm32,Lora,Lorawan,Stm32ldiscovery,我如何通过LoRaWAN发送消息 static void PrepareTxFrame( uint8_t port ) { switch( port ) { case 10: { int pos = 0; pc.printf("Prepare message\n"); #if 0 uint32_t tempValue = ( uint32_t )( LightValue * 1000000.0 ); AppData[0]
static void PrepareTxFrame( uint8_t port )
{
switch( port ) {
case 10: {
int pos = 0;
pc.printf("Prepare message\n");
#if 0
uint32_t tempValue = ( uint32_t )( LightValue * 1000000.0 );
AppData[0] = LightMode;
AppData[1] = ( ( tempValue & 0xFF000000 ) >> 24 ) & 0xFF;
AppData[2] = ( ( tempValue & 0x00FF0000 ) >> 16 ) & 0xFF;
AppData[3] = ( ( tempValue & 0x0000FF00 ) >> 8 ) & 0xFF;
AppData[4] = ( tempValue & 0x000000FF );
#else
AppData[pos] = count;
pc.printf("\n\r");
pc.printf("The value of the counter is : %d", count);
count++;
pc.printf("\n\r");
time_t seconds = time(NULL);
printf("The time is %s", ctime(&seconds));
AppData[++pos] = seconds;
pc.printf("%d \n %d", AppData[0], AppData[1]);
pc.printf("\n\r");
#endif
pc.printf("Message Ready\n");
}
break;
case 15: {
int pos = 0;
AppData[pos++] = AppLedStateOn;
#if 0
if( IsTxConfirmed == true )
{
AppData[pos++] = LoRaMacDownlinkStatus.DownlinkCounter >> 8;
AppData[pos++] = LoRaMacDownlinkStatus.DownlinkCounter;
AppData[pos++] = LoRaMacDownlinkStatus.Rssi >> 8;
AppData[pos++] = LoRaMacDownlinkStatus.Rssi;
AppData[pos++] = LoRaMacDownlinkStatus.Snr;
}
#endif
AppDataSize = pos;
}
break;
case 224:
if( ComplianceTest.LinkCheck == true ) {
ComplianceTest.LinkCheck = false;
AppDataSize = 3;
AppData[0] = 5;
AppData[1] = ComplianceTest.DemodMargin;
AppData[2] = ComplianceTest.NbGateways;
ComplianceTest.State = 1;
} else {
switch( ComplianceTest.State ) {
case 4:
ComplianceTest.State = 1;
break;
case 1:
AppDataSize = 2;
AppData[0] = ComplianceTest.DownLinkCounter >> 8;
AppData[1] = ComplianceTest.DownLinkCounter;
break;
}
}
break;
default:
break;
}
}
/*!
* \brief
*
* Prepares the pay-load of the frame
*
* \retval [0: frame could be send, 1: error]
*/
static bool SendFrame( void )
{
McpsReq_t mcpsReq;
LoRaMacTxInfo_t txInfo;
if( LoRaMacQueryTxPossible( AppDataSize, &txInfo ) != LORAMAC_STATUS_OK )
{
// Send empty frame in order to flush MAC commands
mcpsReq.Type = MCPS_UNCONFIRMED;
mcpsReq.Req.Unconfirmed.fBuffer = NULL;
mcpsReq.Req.Unconfirmed.fBufferSize = 0;
mcpsReq.Req.Unconfirmed.Datarate = LORAWAN_DEFAULT_DATARATE;
LoRaMacUplinkStatus.Acked = false;
LoRaMacUplinkStatus.Port = 0;
LoRaMacUplinkStatus.Buffer = NULL;
LoRaMacUplinkStatus.BufferSize = 0;
SerialDisplayUpdateFrameType( false );
} else {
LoRaMacUplinkStatus.Acked = false;
LoRaMacUplinkStatus.Port = AppPort;
LoRaMacUplinkStatus.Buffer = AppData;
LoRaMacUplinkStatus.BufferSize = AppDataSize;
SerialDisplayUpdateFrameType( IsTxConfirmed );
if( IsTxConfirmed == false ) {
mcpsReq.Type = MCPS_UNCONFIRMED;
mcpsReq.Req.Unconfirmed.fPort = AppPort;
mcpsReq.Req.Unconfirmed.fBuffer = AppData;
mcpsReq.Req.Unconfirmed.fBufferSize = AppDataSize;
mcpsReq.Req.Unconfirmed.Datarate = LORAWAN_DEFAULT_DATARATE;
} else {
mcpsReq.Type = MCPS_CONFIRMED;
mcpsReq.Req.Confirmed.fPort = AppPort;
mcpsReq.Req.Confirmed.fBuffer = AppData;
mcpsReq.Req.Confirmed.fBufferSize = AppDataSize;
mcpsReq.Req.Confirmed.NbTrials = 8;
mcpsReq.Req.Confirmed.Datarate = LORAWAN_DEFAULT_DATARATE;
}
}
if( LoRaMacMcpsRequest( &mcpsReq ) == LORAMAC_STATUS_OK ) {
return false;
}
return true;
}
是否会发送计数器数据和时间?AppData中的数据也是要传输的数据吗?我希望每次LoRa设备传输时都发送计数和时间戳 要发送的有效载荷(AppData
)通过MCPS(MAC公共部分子层)请求提供给LoRaMAC层,例如,对于未确认的帧:
mcpsReq.Req.Unconfirmed.fBuffer = AppData;
因此,物理上(即通过RF),AppData
会被发送,但之前会对其进行加密和封装
PrepareFrame()
函数根据PHYPayload
方案构建要发送的帧(请参阅WAN中的“MAC消息格式”部分)™ 规范1.0.2文件),以下字段:
(1字节)Mac头MHDR
(4字节)终端设备的地址DevAddr
(1字节)帧控制FCtrl
(2字节)帧计数器FCnt
(0-15字节)帧选项FOpts
(0-1字节)端口字段FPort
(0-N字节)MAC帧有效负载加密,您的FRMPayload
已加密AppData
(4字节)消息完整性代码MIC
FRMPayload
根据FPort进行加密。加密算法基于AES 128。如果
FPort
=[1..255],则将使用AppSKey
密钥加密有效负载。否则(
FPort
=0),将使用NwkSKey
密钥对其进行加密。有关详细信息,请参阅
LoRaMacPayloadEncrypt()
函数。
PHYPayload
将由无线电物理层封装
并通过射频发送。您想知道您的代码是否正常工作吗?或者知道哪些数据将以物理方式发送?我想知道哪些数据将以物理方式发送。是AppData中的数据吗?因为我要发送的数据是计数和秒数。我将它们存储在AppData中。但是,我不确定这是否是将要发送的数据。谢谢!但是我如何解密我收到的数据?你在哪里读取你收到的数据?例如,您可以将其用于从网关日志读取的数据。我正在从塔塔托管的网关读取数据。谢谢你的链接。