B4R Question Errors handling on lost connection, client/ server tutorial, 8266 wifi

The Error event will be raised when the device recognizes that the connection has broken. You can add send "ping" messages with a timer and close the connection if there is no response after X seconds.

The reason that this specific example closes the connection after the message is sent is exactly to solve such cases. Maintaining a connection is not simple. It is easier to create a new connection and close it when done.

In order to help you we need to know what are you doing with the connection. Maybe you should use a higher level solution such as MQTT.

I am trying to send messages from many 8266s to a B4A server on a regular basis (at say 10 second intervals). I had three problems:
1) Trying to reduce power consumption, the use of DeepSleep can reduce this to a degree but problem 2) below means that it is almost impossible to battery power the 8266s.
2) the connection time of the 8266 to the router which can be over 10 seconds (even 20S on occasion!). I'm presuming that's outside of B4R's control, probably the router.
3) lost messages: I'm trying to localise the cause now. The 8266s are sending OK but I don't know yet whether the problem is in the transmission or some problem within my B4A code. I'll ask another question if I can't find the answer.

I'm presuming that the lower level transmission is reliable, i.e. if there is a connection then a message send should be safely received. Is that a safe assumption?

Thanks

The server code that you are using is not built for handling multiple connections. A new connection will break the existing one.

You should use MQTT for this. You can run the broker in the B4A app.

OK thanks, I'll give that a try.
I'll ask another question regarding safely adding data to a map in such situations.