Pay for Software Engineer

Hello All,

              I am new to this forum , i am considering going to norway this month , i am Engineering graduate with 2+ industrial experience
for about one year i am working as a freelancer Embedded Software Engineer from india for a Norwegian company  , they  were paying me 15$/ hour rate which is typical for india , now they want me to come to oslo,norway and assist in their development for about 3 months , they are offering to take responsibility of Rent , Food , Transport etc , and they offer me same 15$/hour ( after tax deduction)  Payment , I know this is probably very less compared to the  Par hour rate Paid for embedded Software in Norway , but i have not idea about correct rate in Norway , and the reason they are calling me there is that they don't want to pay Norwegian Price otherwise they could hire local engineer , still i think i should bargain with them , what do you think should be a respectable and good Par Hour Price , if the salary is same as here there is no motive for me to travel that far , also i think even after rent , food etc there can be many expenses in a city like oslo.