How do I do Sample Data write from Central to Peripheral device via WRITE_REQ

[Brajesh]

Hi,

I'm using Central multilink peripheral example to get connected with Our Custom Peripheral App (iOS). I'm able to receive the data from Peripheral device, Now i need to SEND the data to peripheral App.

Can someone suggest me an example from where i can do a sample data write to peripheral device via WRITE_REQ, the characteristic type is NOTIFY, WRITE. Let me know also if type needs to be modified as well??

Thanks Brajesh

[Petter Myhre]

You should have a look at nRF UART for iOS, source code available here.

For the peripheral part you should have a a look at tx_char_add() in ble_app_uart.

You should set

char_md.char_props.write         = 1;

and

BLE_GAP_CONN_SEC_MODE_SET_OPEN(&attr_md.write_perm);

Edit 17.08.2015: Sorry, I was a bit quick on the trigger there.

I recommend having a look at ble_app_uart_c. Available on Github here. More specifically ble_uart_c_write_string()

[Brajesh]

Thanks Petter, I think you got it reverse, iOS is acting as Peripheral and Nordic device would be Central. while in nRF UART app Nordic device is peripheral and App is Central. So i need to look at how do i write data to Peripheral iOS. Any suggestions for Central example which could write ?

[Brajesh]

Thanks Petter for the update and I'm sure this would help. But this example is using S120, I guess this is not gonna make any difference.

I can't see any project file in that git.. hard to checkout API's.

[Petter Myhre]

There is a project file there. ble_app_uart_c/pca10028/s120/arm5_no_packs/ble_app_uart_c_s120_pca10028.uvoptx. I recommend downloading the SDK 8.0.0 zip, and try it out. If you get into trouble, please edit/update your question with more information.

[Brajesh]

Thanks Petter,

I see a problem here. I'm trying to use the same API to write data to Peripheral. For that i needed, cccd_handle and connection handle that i extracted after connecting with iPhone peripheral.

Initially i was getting error no 17(BUSY) , but now i get "READ/WRITE API Returns Success log" though the iOS App doesn't get anything at all.

To validate the API, i tried to write on nRF Peripheral device instead of iPhone App. There i get EVT_WRITE twice (Once for notif_enable from Central and second for sample data write from Central) and i am able to read it on nRF peripheral device.

But iPhone App doesn't get any data.

Is there any different configuration to do the transfer with iPhone Peripheral device ??

[Petter Myhre]

If iOS for some reason doesn't accept the write request I would expect it to at least return an error. Could you examine the BLE_GATTC_EVT_WRITE_RSP event after you write? Please see this MSC.