Cheap 20 EUR walkie talkies are not meant for 24/7 data communication.
If we want build a world without internet nor IP addresses, these cheap walkie talkies will have to perform just on those harsh conditions.
Since last night that it has become possible to send text messages on a web browser through radio, using the speaker and microphone built into the smartphone/laptop.
This means communications that belongs to you and the other people around. It is still early. Still missing to properly receive text messages on cheap walkie talkies too (quite hard), slowly we are getting there.
A true off-grid communication network without fancy hardware.