Evaluate different chips/modules for WiFi, BLE beacons

Use BlueTooth BLE and WiFi beacon frame to transfer sensor data, achieve ultra-low power. Based on CC2541, ESP8266 and NRF24l01+

After testing different chips/modules for WiFi, BLE beacons.

I am leaning toward to use NRF24l01+ send and listen BLE beacon frames.

The reasons:

TI does not provide API to use CC2540/CC2541 in sniffer mode
To write software on CC2540/CC2541, you need IAR, which cost $4,000 USD!
ESP8266 chip use too much power, it is take too long to boot and transmit the packet, the best I can do is 200ms.

Use another MCU (Arduino) with NRF24l01+ , anything can develop the firmware fairly easy. Cost will be low.

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