I have about 200 nodes of ESP-12e(a wifi module based on esp8266) and coding in arduino IDE. I want to connect them to a single wifi modem. Each node works about 3 second and sleeps for about 5 minutes. So probably the actual connected nodes is not more than 15-20 nodes.

A probable solution is to disconnect each node after transfer its data. But the problem is that connectng to a modem take 3-5 second !

I need this 3 guides: 1- which Modem i can select to support this application(please send some links of modem products) 2- which modem configuration needed to optimize that modem to support this application 3- which code techniques i should to use to support this application? Thanks