Xungtong perhaps. 1.27mm castellated. Normal and PA (amplified) versions, pin compatible. 1K pcs USD 4 normal and USD 5 PA.
For me, the MDBT42 module alone is too difficult to handle. I would like this or another module soldered on a small "baseboard" where the "baseboard" itself can be soldered onto "extension boards".
Best I found so far is https://www.tindie.com/products/ElectronutLabs/hackable-tiny-nrf52832-ble-development-board/ .
Imagine "extension boards" like 10DOF, Wifi, LoRaWAN etc.
My heart says Puck.js++ (circular pcb) but my brain says go rectangular. In that domain i would like to see something like Teensy 3.2. Lots of addons and shields, ie on Tindie.
I think you need to use " instead of ', see http://www.espruino.com/Modules
It's a library from 1v94 on. So probably you have an older version.
GSM and LTE are getting cheaper and cheaper: http://www.cnx-software.com/2017/07/26/hologram-lte-software-defined-global-network-for-cellular-iot-projects-starts-at-0-40-per-month-per-device/
I prefer a smaller footprint than arduino. Why not Teensy? Or Adafruit Feather? Or something else with a lot of addon boards.
... or probably not if you have been there already.
Perhaps this helps: http://www.espruino.com/Puck.js+iBeacon (especially the last part)
... and a node.js implementation: https://github.com/landlessness/node-BNO055
Adafruit Arduino Library: https://github.com/adafruit/Adafruit_BNO055
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