Question:
When I read the meters, some of them connected successfully and it shows partial read in the problem meter list, but no data shows in the meter account.

Answer:
What etherpads are you using?

Are they set up to have receive buffers of at least 128 bytes?

If could also be that the client's network is very busy. In that case, try reading them at night (after business has closed).

Rarely, it can also be that his link is of bad quality. This you can see by pinging the server from the IP of the etherpad: see if you get packet loss!

Barring the above, it should read in like a dream.