Weak miner - Openwrt - TPLINK wr710n

[tesla80]

Hello,

I have several TPLINK wr710n devices which supported by Openwrt.
Succeeded to install openwrt firmware inside and created a wifi bridge using them.

What I want is to make them miners of some altcoins.
Devices consume really low power and though I can compile a miner software for openwrt linux and use them as miners.

This is the openwrt page of device : https://wiki.openwrt.org/toh/tp-link/tl-wr710n

Q1 : Which miner do you suggest?
Q2 : Which coin do you suggest?

Are there some experienced people to help me doing this?

Thanks