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does anyone got schematic from this module. I tried searching around but didn't get anything except main header pin-out. There are also 2x2 pin on each corner, but there is no info about them.

enter image description here

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  • \$\begingroup\$ The 2x2 holes are most likely to facilitate mounting. \$\endgroup\$
    – MadHatter
    Dec 28, 2015 at 23:34

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If you look closely, you see the four small copper lines that connect the 2x2 pins to the ground plane. My multimeter confirms this: 0.4 Ohm from ground to each of the 'pins', the same reading for shorted probes.

Besides the chip there isn't much on the PCB that could be interesting: a 26 MHz crystal, a maching network for the antenna, some power decoupling. Probably a copy of the circuit on p25 of the datasheet:

enter image description here

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