How do handle large reads (larger than MAX MTU)?

[juliankrieger]

How would I go on about handling reading values that are larger than the maximum MTU from a characteristic? My characteristic just returns a value of "0" if I write a large string into it.

[taks]

Please provide the following information:

• Peripheral (server) device
• Central (client) device
• The length of string
• Can you read the value of characteristic using android or iOS?

[juliankrieger]

• Peripheral: ESP32 S3
• Central: Samsung Galaxy S8
• 3900 bytes
• No.

My current WIP solution writes MTU - 3 bytes onto read‘s value inside the on_read callback, therefore sending the data in chunks.

[taks]

My current WIP solution writes MTU - 3 bytes onto read‘s value inside the on_read callback, therefore sending the data in chunks.

Could you paste the code?

[taks]

I checked the specifications, the maximum length of characteristic appears to be 512 bytes. (3.2.9 of the specification)

I have checked communication from esp32 to esp32. It was possible to read 800 bytes larger than the specification. But when I increased the size to 1600 bytes, the connection was broken during the read.