S110 mtu change

[zcmm]

hi,all S110 NRF51822 SDK8.0.0 server i want to increase the througout speed,the SDK8.0.0 support changing MTU size?
MTU Can be in 4.0 protocol is modified? if SDK8.0.0 support it,have exmaple?

[endnode]

Edit: sorry, my bad, none of nRF51 SoftDevices support ATT_MTU change procedure, all are capable of default size (23B) only. Note that using BT SIG specification version for feature list is pretty confusing, none of them demands ATT_MTU exchange procedure as mandatory features so you can have BLE stacks (like several Nordic Soft Device types/versions) which are certified as v4.1 or v4.2 but don't support that. It's similar with other features (like PDU extension), always reed detailed spec/feature list not just BT SIG version mentioned in certification documents.

[zcmm]

thanks,can you tell which chapter?i find the MTU MAX SIZE IS 23BYTES ATT both S110 V2.0 and S130 V2.0.
changing MTU is supported for above BLEV4.1?

[zcmm]

ok,why increased ATT_MTU SIZE have high througout?May be beacause Per Connection interval have 6 packet,per packet is ATT_MTU size?

[endnode]

Yes, under some condition you can achieve higher effective bandwidth on top of GATT with non-default ATT_MTU size, however again this is very application-dependent. Don't get confused by some simulated numbers, it's important if your application is half duplex/full-duplex, what are typical packet sizes on top of (G)ATT MTU, if the protocol is completely asynchronous or if it is command-response pair etc. I'd recommend to grab few Dev Kits and simulate it, there is nothing better then proper feasibility study...