need your help plz

Dear all: I have a project to read gas sensor data and send it via wifi to raspberry pi web server. I have multi channel grove gas sensor which is connected to arduino uno and uno is connected to the esp8266 to send the sensor data to pi via WiFi. I really tried many times and I am beginner can any one guide me what to do remembering that I connected UNO to esp8266 using sotware serial library.

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