not able to send more the 20 bytes using bt_gatt_notify api

[madhurubharath]

i am using SDK 1.9.1 to notify data  to peripheral to central device i am using ''bt_gatt_notify " api to send data to mobile but i am able to send only 20 bytes data to central device ,but my requirement i am getting packets from MCU  with 240 bytes each pkt ,but i am not able to transmit full pkt once data i am splitting the pkt 20 bytes  and sending but the requirement is need to send pkt by pkt continually please help to solve the problem.   

[madhurubharath]

hello edvin if i use  bt_gatt_exchange function  i ma not able to connect the device to central device its i think it resting the controller i dont know exactly. 

err = bt_gatt_exchange_mtu(default_conn,&exchange_params);
if(err == 0)
{
DPRINTF("MTU CHANGED\n\r");
}
else
{
DPRINTF("MTU NOT_CHANGED\n\r");
}

and now i am using default_con in the place of NULL

tm_status=bt_gatt_notify(default_conn, &ccbg_serv.attrs[1], sPtr ,ble_tx_size);

 

please help to solve this problem

regards,

bharath.m

[madhurubharath]

if i am trying to use   this function bt_gatt_exchange_mtu this function is not fetching controller stops  rest of the functions are not working.

it will be grate for my project if you solve this problem 

thanks &regards,

bharath.m.

[Edvin]

madhurubharath said:

if i use  bt_gatt_exchange function  i ma not able to connect the device to central device

What does it do? Does the log say anything? Does it print "MTU CHANGED" or "MTU NOT_CHANGED"?

madhurubharath said:

and now i am using default_con in the place of NULL

tm_status=bt_gatt_notify(default_conn, &ccbg_serv.attrs[1], sPtr ,ble_tx_size);

What does bt_gatt_notify return? What is tm_status after bt_gatt_notify has been called? (try printing it in the log).

[madhurubharath]

its disconnecting the BLE. from central device.

[Edvin]

Does the application crash/reset? Or does it trigger a bt_disconnect()? The bluetooth stack never disconnects on it's own. What does the log say?

BR,

Edvin