printing - print thailand characters on bluetooth printer android -

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i need print thailand characters through bluetooth printer. if print data android console it's displays in thai language.

but same data when sent bluetooth printer, prints junk value.

i have tried 

encoding charset.forname("utf-8").encode("วันที่").array();  string str = "วันที่".getbytes(charset.forname("ts-620")).

but nothing seems working fine. can 1 guide me on this.


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