The Z-Stack-CC2530 gets RSSI from source to destination

Hi,

That depends on several scenarios, but my guess is you are following the next scenario:

An End Device (with unknown position - in other words a bind node) broadcasting a message

to nearest routers, then routers forward extracted RSSI values to concentrator node, where the

position is calculated from received data (in case where concentrator node used as gateway,

these calculations can be performed by the host)

So if this is your scenario you can do the following to get true values of RSSI:

1. Blind Node should broadcast a ZigBee application level message (it can be even a
   dummy message) to nearest routers (broadcast radius = 1, in this case no rebroadcasts
   will be carried out by the router)
2. In each router that got the dummy message, extract the RSSI value, construct a new
   message that must contain at least two arguments; RSSI value and short address of the
   blind node. Send this message (fro each router participating in this carnival) to 
   concentrator node.
3. In concentrator (or host PC) collect all the messages with RSSI values and then
   you are ready to do the math crunching :) 

Dear,

             Sorry, I don't understand dummy message. 

             I just use  a coordinator, a router and a end-device.

             The end-device send a request to router. 

             Then the router send a message to end-device.

             After receive the message, the end-device extracts RSSI values, and construct a new message.

             Finally, the end-device send the new message to coordinator.

             I use above-mentioned method to extract RSSI values, but the RSSI values is not between router and end-device.

             It is between router and coordinator.

I have two problems, now.

             1.Is the method error?

             2.How should I extract RSSI values between router and end-device or end-device and end-device? 

Dear,

          I understand what you mean.

          Can one end-device join two router at one time?

          Because I need three reference node positioned one bind node.

          The reference node is router and the bind node is end-device. 

Best regards,

Hi,

It is impossible to join two router at one time.

Dear,

           OK, I see.

            I will try it.

            Thanks you for your answer and suggest.

Dear,

           Can I set  scan range of the router or the coordinator?

           If I can. How should I do?

Hi,

What you mean by scan range?

Dear,

                         Assume the distance is 1m between the router and the end device.

                          The router can discover the end device and the end device join the router.

                          Can I set the distance between the router and the end device, in Z-Stack ?

                          I want to set the distance that the end device join the router.

  Best regards,

            Dennis

Hi,

Well, there is no direct way that I'm aware of. The indirect way is to reduce

You can read about changing transmit power of device in "Z-stack API.pdf"

section 3.5.1

Dear,

             I increase a router called in the zigbee network.

             So, it has two router, one is R1 and the other is R2.

             Now, the parent of the end device is the R1.

              I can extract RSSI value between the R1 and the end device.

              But, I can not extract RSSI values between the R2 and the end device.

Best regards,

                 Dennis

Hi,

Well that is a normal behavior of ZigBee network, all messages addressed

to a specific ZED will be routed to ZEDs parent, then the parent will send this

message to ZED.

So, your question is how to overcome this behavior?

Well, one way is to implement the scenario I have described in my first post in

this thread. You may try it. :)

Dear Igor,

  I have been try it.

 If the parent of end device is R1. I can extract RSSI values between the R1 and the end device. The RSSI values is right.

 But, when I extract RSSI values between the R2 and the end device, the RSSI values is error.

 If the parent of end device is R2. I can extract RSSI values between the R2 and the end device. The RSSI values is right, too.

 But, when I extract RSSI values between the R1 and the end device, the RSSI values is error, too.

  I need the RSSI measured the distance between R1 and end device, and  the distance between R2 and end device.  

 I have to extract RSSI values between R1 and end device, and between R2 and end device at one time.

 So, my question is how to get right RSSI values between R1 and end device, and between R2 and end device?

  I use CC2530 chip. The ZStack version is ZStack-CC2530-2.3.0-1.4.0.

  In the zigbee application layer, I use pkt->rssi to extract RSSI values.

 Best regards,

            Dennis                 

Hi,

It sounds like the ZED isn't broadcasting this message, in other words, in your ZED project you should use

AF_DataRequest() function as follows:

RTR_App_DstAddr.addr.shortAddr = 0xFFFC; //Routers and coordinator
RTR_App_DstAddr.addrMode = (afAddrMode_t)AddrBroadcast;
RTR_App_DstAddr.endPoint = RTR_ENDPOINT;

AF_DataRequest( &RTR_App_DstAddr, &XZED_App_epDesc,
RTR_APP_CLUSTERID,
someLen,
(byte *)message,
&ZED_App_TransID,
AF_DISCV_ROUTE | AF_SKIP_ROUTING,
1 );

Pay attention on lines marked with red:

The destination address should be of broadcast type (0xFFFC or 0xFFFD)

Addressing mode should be AddrBroadcast.

In options field, AF_SKIP_ROUTING must be ORed with other options (this flag

prevents from ZigBee to perform routing)

Radius field should be set to 1 (that means no broadcasting beyond the first wave).

Dear Igor,

                   I think that the problem is the parent of end device.

                   I use zb_SendDataRequest()  function as follow:

void zb_SendDataRequest ( uint16 destination, uint16 commandId, uint8 *pData, uint8 len, uint8 radius )
{
afAddrType_t dstAddr;
/* 設置目的地址 */
if (destination == 0xFFFF)
{
// 廣播
dstAddr.addrMode = AddrBroadcast;
dstAddr.addr.shortAddr = NWK_BROADCAST_SHORTADDR; //0xFFFF 資料封包將被傳送到網路中所有的設備
dstAddr.endPoint = SampleApp_epDesc.endPoint;
if ( AF_DataRequest( &dstAddr,
&SampleApp_epDesc,
commandId,
len,
pData,
&SampleApp_TransID,
AF_DISCV_ROUTE,
AF_DEFAULT_RADIUS ) == afStatus_SUCCESS )
{
}
else
{

// Error occurred in request to send.
}
}
else if (destination == 0xFFFC)
{
dstAddr.addrMode = (afAddrMode_t)AddrBroadcast;;
dstAddr.addr.shortAddr = NWK_BROADCAST_SHORTADDR_DEVZCZR; //0xFFFC 廣播給協調者和全部的路由器
dstAddr.endPoint = SampleApp_epDesc.endPoint;
if ( AF_DataRequest( &dstAddr,
&SampleApp_epDesc,
commandId,
len,
pData,
&SampleApp_TransID,
AF_DISCV_ROUTE | AF_SKIP_ROUTING,
1 ) == afStatus_SUCCESS )
{
}
}
else
{
// 使用短位址
dstAddr.addrMode = afAddr16Bit;
dstAddr.addr.shortAddr = destination; //shortAddr 目標設備位址
/* 設置端點 */
dstAddr.endPoint = SampleApp_epDesc.endPoint;

/* 發送消息 */
if ( AF_DataRequest( &dstAddr,
&SampleApp_epDesc,
commandId,
len,
pData,
&SampleApp_TransID,
AF_DISCV_ROUTE,
AF_DEFAULT_RADIUS ) == afStatus_SUCCESS )
{
}
else
{

// Error occurred in request to send.
}
}
}

Best regards,

              Dennis