Update multiple datastreams with connection keep-alive

[diegostf]

Hi everyone,

I’m working on a project using the Blynk HTTP RESTful API (/external/api/batch/update) with a SIM7000G modem and TinyGSM library. I’ve noticed that when using Connection: keep-alive, only the first request updates the datastreams, and subsequent requests don’t seem to work unless I close the connection each time with Connection: close. This results in slower data sending due to the need to reconnect.

Is it possible to maintain an HTTP connection open for a period to send data more quickly (e.g., reusing the connection for multiple updates)? If so, what is the time limit for keeping the connection alive before it times out or gets closed by the Blynk server? Any insights or workarounds would be greatly appreciated!

Thanks,

[PeteKnight]

If you use the HTTP rather than HTTPS API call then it connects much faster…

Webhook widget

Okay, I’ve been doing some testing this afternoon. I’ve been using an ESP32 and the HTTPClient.h library. I’ve not tested with an ESP8266 and the ESP8266HTTPClient.h library, but I wouldn’t expect the results to be much different. I’ve managed to use the HTTPS API call with both the BlynkSimpleEsp32.h and BlynkSimpleEsp32_SSL.h libraries, however, the response times from the HTTPS API call are much longer than when using the HTTP API call. I guess this is what was causing @Blynk_Coeur’s -5 err…

Pete.