BT840 operation

[sivaguru]

Is it possible to implement open thread cli using  16 castellated pins of BT840  ??  I can change the uart pin by rebuilding the open thread libraries ,

Can I avoid using  45 LGA (Land Grid Array) pins and 3 ground pins (F0,F1,F2,F3) ???    because  i can't solder those pins

[ketiljo]

Maybe find another module? You need to solder all the ground pins if there aren't any ground pins on the sides. In any case, any GPIO can be used for UART.