nRF52840, MQTT, TLS1.2

[Reto]

Dear Nordic,

What I want to do:

• Battery powered sensor network
• One gateway (BLE --> WLAN) with a serial-to-wifi chip connected to nRF52
• MQTT (IBM Bluemix --> CoAP is not supported)
• TLS1.2 (IBM Bluemix)
• Long range (Bluetooth 5), indoor and outdoor

So I guess I need a nRF52840. What is the best SDK to start with?

• nRF5 SDK for IoT?
• nRF5-SDK V13.0.0?
• Any good example around?

Thank you!

[Petter Myhre]

Where do you want the MQTT endpoint(s)? In each node or in the gateway?

[Reto]

MQTT endpoint in every nRF52840 FW. That is:

• Gateway (Bluetooth master)
• Sensors (Bluetooth slaves)

Thank you for your question :-)

[Petter Myhre]

Unfortunately, we do not have support for IPSP router role, which you would need in the gateway.

See this for more information.

[Reto]

Thank you Petter! So, if I got this right, then it means the following:

• There is no way running MQTT (TLS1.2) on a nRF52 and having this nRF52 running as Bluetooth master (central role / observer role)?

• Alternative? Running MQTT on ESP8266? ESP8266 communicate with nRF52-central-role-device over UART. Sensor devices (nRF52 peripheral role / broadcaster role) communicate to nRF52-central-role-device over Bluetooth.

If this is correct: With which SDK should I start?

Again: Thank you very much Petter.

[Petter Myhre]

You are correct. Then I recommend starting off with the normal SDK, nRF5 SDK 13.0.0, more specifically the ble_app_uart and ble_app_uart_c examples.