Android Question chat app?

[Devv]

hi
what would be an easy way to make 2 way text chat between 2 android devices using or without using a server ?

 

[NJDude]

You can start by checking THIS post.

 

[Devv]

NJDude
what does popular chat services (whatsapp - viber ..) use ? tcp ?

 

[NJDude]

Those apps are more complicated and yes, they use TCP to communicate.

 

[Devv]

i thought tcp needs port forwarding ?