Raspberry Pi and nodemcu simple pulse counting project

I want to create raspberry pi as sever and nodemcu esp8266 as a client, And total 30 nodemcu is connected to raspberry pi server without the Internet. If total 30 nodemcu send data to server on same time then all data is proper to receive on the server without any problem. In client side, we use any 3 pins (Choice is yours) of nodemcu esp8266 for sending data and taking data from the server. In nodemcu one pin I am given some pulses (its digital pulse like 5v) and we set one pulse value is 10 that pulses come fastest fast so all pulse goes on server and count it, means if we set 1pulse value is 10 and we give 10 pulses to one pin then total value is 100 store in server, like that if all nodemcu send the same pulse then all pulse value count and show in server In nodemcu pin two I am given only one pulse when I am given that pulse then server identify (Out of 30) which nodemcu send that pulse/signal and total store pulse value convert in normal pulse means if 100 pulse value showing on server and we set 1 pulse value is 10 then server sends 10 pulses signal to only identified nodemcu and that nodemcu 3rd pin generate 10 pulse. Its simple pulse counting project, so I can’t pay the high cost.