Unable to write to peripheral

RE: Unable to write to peripheral

Hung Bui — Thu, 11 Jun 2015 12:08:27 GMT

@nejcokle: please create separate cases for different questions. Your question on just work pairing is not quite related to the original question.

If you have fixed the issue, please accept the answer from Carles or create your own answer that explain how you solved it.

This would help other member if they face the same issue.

RE: Unable to write to peripheral

nejcokle — Thu, 11 Jun 2015 10:22:31 GMT

I figured out what's probably the problem.How can i set up just works pair method?

RE: Unable to write to peripheral

nejcokle — Thu, 11 Jun 2015 10:09:00 GMT

I modefied my peripheral to be write and not write with no response. I use WRITE_REQ but i get handle 0x39 (BLE_GATTC_EVT_TIMEOUT). if i use gatt status in this response i get 0x0001 (BLE_GATT_STATUS_UNKNOWN )

RE: Unable to write to peripheral

Carles — Thu, 11 Jun 2015 08:47:41 GMT

If you write with a WRITE_REQ from the nRF51, what do you get as an error code in the response? see my previous comment, you should check gatt_status in the response event

RE: Unable to write to peripheral

nejcokle — Thu, 11 Jun 2015 07:25:47 GMT

Is there a way to check if handle value is correct? It should be, but since i tried everything (even checking the peripheral) i'm not so sure anymore...

EDIT: I am 100% sure handle is right, i used dongle to check. I still can't write with my central module, but can write with my smartphone as central just fine.

RE: Unable to write to peripheral

Carles — Wed, 10 Jun 2015 13:41:17 GMT

If you are sure the handle is correct and the call to sd_ble_gattc_write() returns NRF_SUCCESS then the only item remaining to analyze is your peripheral. Have you tried using BLE_GATT_OP_WRITE_REQ and then waiting for a BLE_GATTC_EVT_WRITE_RSP event? inside that event the gatt_status should tell you if the write was performed correctly or not. Maybe you need to bond first.

RE: Unable to write to peripheral

nejcokle — Wed, 10 Jun 2015 13:36:55 GMT

I tried with BLE_GATT_OP_WRITE_CMD too, but i still can't write to my peripheral.

RE: Unable to write to peripheral

Carles — Wed, 10 Jun 2015 12:02:45 GMT

Peripheral is write with no response only.

In that case you should be using:

BLE_GATT_OP_WRITE_CMD

instead of:

BLE_GATT_OP_WRITE_REQ

Carles