ble_app_uart multilink_central with a peripheral

RE: ble_app_uart multilink_central with a peripheral

Enzo — Mon, 23 Apr 2018 09:14:29 GMT

Thank you for your reply.

RE: ble_app_uart multilink_central with a peripheral

Homer Lu — Thu, 19 Apr 2018 05:42:03 GMT

I am using SDK v14.2

// m_nus register a event handler ble_nus_on_ble_evt() by using marco BLE_NUS_DEF

BLE_NUS_DEF(m_nus);

// All event will be handled by ble_nus_on_ble_evt(), NOT only NUS related events

// If BLE_GAP_EVT_CONNECTED event comes,

// ble_nus_on_ble_evt() calls on_connect() then set p_nus->conn_handle to p_ble_evt->evt.gap_evt.conn_handle;

// (ble_nus.c LN63)

// That means "Any new connection will set m_nus.conn_handle to be the new connect handle"

// to resolve this issue, i use following code

// but this work only if you have only 1 peripheral

static ble_nus_t m_nus;
static void wrapper_ble_nus_on_ble_evt(ble_evt_t const * p_ble_evt, void * p_context)
{
uint16_t conn_handle;
uint16_t role;
ble_nus_t * p_nus = (ble_nus_t *)p_context;

if ((p_nus == NULL) || (p_ble_evt == NULL)) {
return;
}

conn_handle = p_ble_evt->evt.gap_evt.conn_handle;
role = ble_conn_state_role(conn_handle);

if (role == BLE_GAP_ROLE_PERIPH) {
ble_nus_on_ble_evt(p_ble_evt, p_context);
}
}
NRF_SDH_BLE_OBSERVER(m_nus_obs, BLE_NUS_BLE_OBSERVER_PRIO, wrapper_ble_nus_on_ble_evt, &m_nus);

RE: ble_app_uart multilink_central with a peripheral

Enzo — Fri, 08 Dec 2017 02:16:43 GMT

Thanks Petter.
Now i get it.
You really help me a lot. I dont think i can fix this issue without your help.I don't know much about BLE,there is a lot need to learn. Thanks again.

RE: ble_app_uart multilink_central with a peripheral

Petter Myhre — Thu, 07 Dec 2017 15:51:48 GMT

It seems you are using the incorrect connection handle when you call sd_ble_gatts_hvx() after the second board have connected. You are using the connection handle of the connection to the second board. This is because of the handling of BLE_GAP_EVT_CONNECTED in ble_nus_on_ble_evt(). Here on_connect() is called and the incorrect connection handle is set. When you disconnect and connect again the correct connection handle is set.

RE: ble_app_uart multilink_central with a peripheral

Petter Myhre — Thu, 07 Dec 2017 11:49:37 GMT

Next time I would appreciate if you would just upload the complete project. However, I got it to compile, and it seems to be running. How do I reproduce?

RE: ble_app_uart multilink_central with a peripheral

Petter Myhre — Wed, 06 Dec 2017 16:49:09 GMT

I see. Thanks.

RE: ble_app_uart multilink_central with a peripheral

Enzo — Wed, 06 Dec 2017 15:55:03 GMT

not sd_ble_gatts_hvx.it's function ble_nus_string_send check parameter m_nus and return NRF_ERROR_INVALID_STATE

RE: ble_app_uart multilink_central with a peripheral

Petter Myhre — Wed, 06 Dec 2017 15:47:50 GMT

Are you saying sd_ble_gatts_hvx() returns NRF_ERROR_INVALID_STATE after you are disconnected? That is expected. Let me know. I'll test your project first thing tomorrow.

RE: ble_app_uart multilink_central with a peripheral

Enzo — Wed, 06 Dec 2017 13:41:01 GMT

I'm sure ble_nus_string_send()return error 13313.i will try it tomorrow about nRF Toolbox.and i'll get NRF_ERROR_INVALID_STATE when a peripheral only board disconnected,then the first board connected with nRF toolbox send data to nRF toolbox by ble_nus_string_send().

RE: ble_app_uart multilink_central with a peripheral

Petter Myhre — Wed, 06 Dec 2017 13:21:50 GMT

Just to confirm, sd_ble_gatts_hvx() inside ble_nus_string_send() returns 0x3401 (BLE_ERROR_GATTS_SYS_ATTR_MISSING)? Have you checked the parameters given to sd_ble_gatts_hvx() before and after you disconnect and reconnect the nRF Toolbox?

NRF_ERROR_INVALID_STATE ? Which function return this?

RE: ble_app_uart multilink_central with a peripheral

Enzo — Wed, 06 Dec 2017 07:17:02 GMT

thank you Petter.I've upload the code file that I've changed.this

and I found that first board will get NRF_ERROR_INVALID_STATE if the second board disconnected.that's all i get

RE: ble_app_uart multilink_central with a peripheral

Petter Myhre — Tue, 05 Dec 2017 14:59:48 GMT

RE: ble_app_uart multilink_central with a peripheral

Enzo — Tue, 05 Dec 2017 06:43:53 GMT

not cool