multi link central uart with multiple peripheral

[ps_anu]

hi...

I have modified the multi link central to multi link central uart , i can able to connect with 8 peripherals . One central getting connected with multiple peripheral, data are getting transfer between them. Now i want to differentiate the multiple peripherals to central , by using different uuid or name , product address . so that i can able to send the data to particular peripheral device from central .

how can i input the different uuid or name for multiple peripheral ?  i need some sample 

for example i am having central1 , peripherals (A,B,C,D) suppose A want to send message to D how can it send ? is it possible to transfer the data between the peripheral

suggest me a good one 

Thanks in advance 

[ovrebekk]

Hi 

Every link on the central side will be identified by a unique connection handle, which is a 16-bit value that starts at 0 and is incremented for each additional link. 

If you want you can map the connection handle to something else, such as the BLE address or a device name, but whenever you want to send something to a specific device you need to use the connection handle of that device to address it. 

It is important to know that each device could get a different connection handle each time it connects to the central, so the central will have to update the connection handle/BLE address map continuously as devices are disconnected and connected. 

It is also important to know that the connection handle for a link is not necessarily the same on the peripheral and central side (a peripheral with only one link to a master will only use connection handle 0). 

Best regards
Torbjørn

[ps_anu]

Thank your explanation , how to send the data via uart using connection handle of specific device 

Best regards ,

pavi

[ps_anu]

can we able  send the message to  particular device (peripheral to peripheral )by manually , similar like this central has been connected 4 peripherals ( A--B---C--D)by using name of the peripheral .In this case peripheral A wants to send the message to the peripheral D, similarly peripheral D wants to send the message to peripheral B , C . so communication has to be done randomly .,whoever in connection in central  from end to end , (A B C D ) peripherals  have to send the data to each other .is it possible ? 

can we resolve by using connection handle . 

A--- HAS 0X01 connection handle 

B----HAS 0X02 connection handle 

C----HAS 0X03 connection handle so on

example if A want to send the data to C 

can i able to enter manually like ------ A (0X01) , hello to B(0x02) 

or else is there any other way to communicate the peripheral to peripheral

Best regards

pavi

[ps_anu]

connection handle are created by the softdevice right , so how to put the connection handle in an array ,by that way i can able  to get the particular peripheral to send the data , is it possible ?

Best regards,

pavi

[ovrebekk]

Hi 

When a device establishes a connection you will receive the BLE_GAP_EVT_CONNECTED event on the peripheral and central side. 

Inside this event you can read the connection handle from the p_ble_evt->evt.gap_evt->conn_handle variable. 

Then you can update your local variable associating connection handle with the device from there. 

Best regards
Torbjørn

[ps_anu]

i am not familiar that much in programming . can you explain me with sample code , i want to send to data by using connection handle . i want to put all connected devices in an array so i can able to transmit the data to particular device 

Thank you