Connecting board to wifi minimally


hello, i'm working on project i'd connected internet wirelessly minimum costs.
i'll using uno now, i'd able use smaller board such nano, mini or micro.

what want able able have button can carry around anywhere (battery powered not issue) , when press button send request server wirelessly (as long connected wifi).

i'd able connect internet easily, possibly using wps push button method connect board wifi or able manually enter credentials plugging device 1 set wifi credentials on fly (eg having board let me change config files on board without hassle).

the problem i'm having can't find way connect board internet cheaply , reliably.

anybody have suggestions/solutions?
thanks.

the problem i'm having can't find way connect board internet cheaply , reliably.
i thought, your comment on other thread, favoured rpi solution ?

there appears yun competitor emerging - see this thread.

...r


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