Transmission interval

With this parameter you can set how often the logger sends data to the Efento Cloud platform or a server. You can set any value from 5 minutes to 10 days. The maximum value of the transmission interval depends on the measurement interval - it can be set to 60 times the measurement interval (e.g. measurement interval = 1 minute, transmission interval can be set to any value from 5 minutes to 60 minutes).

If the logger works with Efento Cloud, the platform informs the user when the new data from the device is expected.

Additionally, it is possible to configure how often the message sent by the logger requires confirmation of receipt by the server (ACK). If the ACK is not received by the logger, it will retransmit the data to the server. The confirmation frame (ACK) is used also to send a new configuration to the device.

Type of messages sent by the loggers depend on the use case. If your use case requires all the messages to reach the server, then you should set the logger to always require the ACK. If your use case is not critical, and you are aware that some data frames can be lost, you can set the device to require the confirmation less often (e.g. every 24 hours). This will increase the battery lifetime, as the device stays in the transmission mode for less time.

Devices receive new configurations from the server through ACK frames. Keep this in mind when setting the ACK interval to more than 24 hours.

Logger stores up to 30 000 measurements in its memory. In case of any issues that block the communication between logger and server (network issue, server issue, etc.), if the ACKs are enabled, the logger will resent the missing data to the server.

In order to set the transmission interval:

1. Connect to the logger, tap on the three dots in the upper right corner -> “Advanced” -> “Sending interval”

2. Set the new transmission interval - remember that it can’t be less than measurement interval and more than 60 times the measurement interval

3. Set the ACK interval. You can set it to:

4. Always - every data frame sent by the logger will require the ACK from the server. If the data has not reached the server, it will be retransmitted once the connection is reestablished

5. Every - you can set how often the device should require the ACK from the server (e.g. every 3rd transmission, every 24th transmission). This is a good balance between making sure the data reaches the server and battery lifetime

In order to make sure that all the measurements reach the server, set the ACK interval to “Always”. In case of any transmission issues, the logger will try to resend the data until it succeeds.