It's all depends how u maintain things and make simple in ur server side
it realy depend on your user number and your team experience , if you have huge number of use as mr arega said you can have tcp realtime , another option would be use gcm
if you have a few user just use rest service in small interval , i dont know about telegram buy it is open source you can read it
If u have few user u can see socket io
Yes Thats great node library mr suthar
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