How to fix android bluetooth disabled on start up or after airplane mode

The bluetooth serivice of my android smartphone is disabled on start up or after airplane mode.

Seems to be an android issue due to the enabling of bluetooth scanning for location service.
To disable the bluetooth scanning go to android setting and select Location, press the 3 dots in upper right corner, select Scanning and disable Bluetooth scanning.

Smart solar water heating solution final report for Open IoT Challenge 4.0!

Smart solar water heating solution uses IoT and AI technologies to improve the efficiency of passive solar water heating system. This solution has been developed to take part in the Open IoT Challenge 4.0!

Solar water heating Solar water heating (SWH) is the conversion of sunlight into heat for water heating using a solar thermal collector. Solar water heating systems include storage tanks and solar collectors. There are two types of solar water heating systems: active, which have circulating pumps and controls, and passive, which don't.
Passive solar water heating systems are typically less expensive than active systems, but they're usually not as efficient. However, passive systems can be more reliable and may last longer.

The solar panels heat the water in the storage tank when they are affected by the sun rays. The water reaches the highest temperature when the sun is stronger. If the water in the solar panel is hot the divert valve close the flow towards the boiler so the …

IoT cloud platform with EnMasse and Apache Spark using Red Hat OpenShift

The server uses a computer with OpenShift to deploy EnMasse and Apache Spark. The sources of the project are available on GitHub:

OpenShift OpenShift is a computer software product from Red Hat for container-based software deployment and management. It is a supported distribution of Kubernetes using Docker containers and DevOps tools for accelerated application development. OpenShift may be executed locally by running a single-node OpenShift cluster inside a VM using minishift but it requires a hypervisor to start the virtual machine on which the OpenShift cluster is provisioned. The full installation documentation may be found here:
You need at least 6GB of RAM for your minishift instance since we're running both EnMasse and Spark on a local OpenShift cluster.

Once this command completes, the OpenShi…

IoT gateway with Raspberry Pi using Eclipse Kura

The gateway uses a Raspberry Pi with Eclipse Kura to run the application that controls the relay board, Eclipse Leshan to communicate with the sensor, and Eclipse Paho to communicate with the server. The sources of the project are available on GitHub:

Eclipse Kura Eclipse Kura offers a platform that can live at the boundary between the private device network and the local network, public Internet or cellular network providing a manageable and intelligent gateway for that boundary capable of running applications that can harvest locally gathered information and deliver it reliably to the cloud.
Eclipse Kura can be installed on a Raspberry Pi but it requires Raspbian, gdebi and OpenJDK. You can find the detailed instrucions on official web site:
The Kura development environment may be installed on a Windows, Linux, or Mac OS. The setup instructions…

IoT temperature sensor with ESP8266 using LWM2M (Eclipse Wakaama)

The sensor uses an ESP8266 board with the protocol Lightweight M2M to communicate the temperature read by DS18B20 to the gateway. The sources of the project are available on GitHub:

ESP8266The ESP8266 is a low-cost Wi-Fi microchip with full TCP/IP stack and microcontroller capability produced by Espressif Systems. The avalability of same SDK allows the chip to be programmed, removing the need for a separate microcontroller. To program the microchip i use the SDK Arduino core for ESP8266 WiFi chip and PlatformIO, that is an open source ecosystem for IoT development. LwM2M Lightweight M2M is a protocol from the Open Mobile Alliance for M2M or IoT device management and communication. It uses CoAP, a light and compact protocol with an efficient resource data model, for the application layer communication between LWM2M Servers and LWM2M Clients. Each service on a constrained device/sensor/actor is modelled as an LWM2M o…

Build an Android app to control a Q7 Camera P2P WIFI

This tutorial will teach you how to build an Android app to control a Q7 Camera P2P WIFI using the Android Studio development environment.

Start a new project
I create a new project with application name "Q7Camera". During the wizard i add a basic activity.

Import native libraries and sources To control the camera you need the libraries at this link: Copy the previous library in the path "app/src/main/jniLibs/armeabi" of your project. The packages to import are x1.Studio.Core at and com.microembed.sccodec at

Edit the manifest To use the native libraries you need to add the following permissions to the manifest:
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="a…

Connect wan automatically at boot and after a disconnection on OpenWrt

OpenWrt is an open source project for embedded operating system based on Linux, primarily used on embedded devices to route network traffic. I install OpenWrt on my Netgear DGN3500, an ADSL2+ gateway with wireless acccess point integrated. Finally the wifi signal is strong but the internet connection does not go up at boot or after a disconnection.

Found solutions I find the following solutions: to schedule the reboot and the reconnections by cron (, to write a script to reconnect after a disconnection ( or to insert the command "ifup wan" in the file "/etc/init.d/network".

Recomended solutionTo take all the advantages of the previous solutions i write the script "wanup" to connect the wan and i call its at boot and after the disconnection. To call the script "wanup" at boot you can insert t…