EzDevInfo.com

How to implement update value callback when peripheral itself is changing the characteristic value

Suppose if the peripheral is listening to some socket or pipe in which I am sending a value which will modify the characteristic. How can I notify that change to the central device? Both peripheral and central devices are running on the Linux platform. Because whatever the Pizza example given for Linux device will notify the central only when central is writing something. Suppose if the value is changed by some program outside Bleno an noble where I should implement the updateValueCallback()? Is it on onSubscribe or onNotify?

Raspberry bluetooth peripheral with Bluez and Bleno

i'm trying to create a raspberry bluetooth peripheral, i'm using Raspbian, and Bluez v 5.11, i have tried a lot to make it work, but i can't find a way to solve the problem, i'm using a USB bluetooth dongle Inatek BTA-CSR4B5, if i do this:

hciconfig

i have:

hci0:   Type: BR/EDR  Bus: USB
    BD Address: 00:1A:7D:DA:71:13  ACL MTU: 310:10  SCO MTU: 64:8
    UP RUNNING 
    RX bytes:5050 acl:79 sco:0 events:493 errors:0
    TX bytes:8994 acl:78 sco:0 commands:395 errors:0

so the device seems that is working perfectly, if i try to make it an iBeacon for example doing this script:

ibeacon.conf:

export BLUETOOTH_DEVICE=hci0
export UUID="e2 c5 6d b5 df fb 48 d2 b0 60 d0 f5 a7 10 96 e0"
export MAJOR="00 16"
export MINOR="00 08"
export POWER="c5"

ibeacon_start

#!/bin/sh
. ./ibeacon.conf
echo "Launching virtual iBeacon..."
sudo hciconfig $BLUETOOTH_DEVICE up
sudo hciconfig $BLUETOOTH_DEVICE noleadv
sudo hciconfig $BLUETOOTH_DEVICE leadv 0
sudo hcitool -i hci0 cmd 0x08 0x0008 1e 02 01 1a 1a ff 4c 00 02 15 $UUID $MAJOR $MINOR $POWER 00
echo "Complete"

it works.

But i want make a bluetooth peripheral, and to do it i'm using this library:

https://github.com/sandeepmistry/bleno

when i start a test code in the bleno project, i can find the service, but when i'm trying to connect to the peripheral with a iOS device i get a Timing out connection.

I have make a lot of test,and i have find an half-solution for the problem, if i start the service with bleno, and the service is on, in another terminal i'm doing this:

sudo hciconfig hci0 up
sudo hciconfig hci0 noleadv
sudo hciconfig hci0 leadv 0

and when i try to connect to the peripheral works, then when i disconnect to peripheral and i try to connect it again, doesn't work anymore, and to make works it again i have to do this again:

sudo hciconfig hci0 up
sudo hciconfig hci0 noleadv
sudo hciconfig hci0 leadv 0

so my question is, how i can solve my problem? so avoid to do every time the command above, and make a bluetooth peripheral that accept always the connection?