Improve debug possibilities in write-influx function

[Tonic8]

Hello

on my last usages i got "random" errors in the result formatting. When sending thousands of lines it's hard to see which line got a return HTTP error 400.

It could be useful to get a error debug possibility, like write errors in a file (the data sent and the error code sent back) like a try and catch and send the data to a variable we can then write in a log file when needed.

Tonic8 (sorry as i'm a newbie on GitHub i don't know how to set this as "enhancement" and not an issue)