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.

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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: https://github.com/brusdev/smart-solar-heating-system/tree/master/sensor

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…

Smart solar water heating solution to take part in the 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 is designed 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 boile…

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 …

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