httr package in R - Not Getting all the observations from KOBO Data

Question

I am using following code to GET data using API from the KOBO server, it downloads only 30000 observations instead of all 85,000 observations.

rawdata<-GET(url,authenticate(u,pw, type = "basic"),progress())
observer <- content(rawdata,"raw",encoding="UTF-8")
observer <- read_csv(observer)
observer <- as.data.frame(observer)

Using same code, I am able to download all observations when smaller no of observations.

Looking for help