I’m using ESP8266 Nodemcu to collect data from 3 different sensors and then upload these data on Ubidots.
When the WiFi is connected everything works fine, but as soon as the WiFi disconnects I’ll create a txt or csv file to log in the data. When the the device is connected to WiFi again I want to upload the txt/csv file to Ubidots.
I’m not sure if that is possible, if so how can I upload the txt/csv file on Ubidots? Could you please elaborate on your answer.