LE Set Data Length returns Unsupported Feature or Parameter Value

1
votes

I setup a gatt-server on samsung platform (using bluez 5.47), upon client connect I want to configure the data length (this sets the link layer packet length) which will return Unsupported Feature or Parameter Value.

the same command works when I setup a client that connects to a remote gatt-server. * according to bluetooth core spec 4.2 I should be able to do that "Both the master and slave can initiate this procedure at any time after entering the Connection State". * I tried to enter some default values of tx octet 27, tx time 328, this does not work. (probably means this isn't parameter value issue). anyone know why is that not working? * just to be noted, I would like this to be set in order to increase throughput. currently set MTU and connection params only.

< HCI Command: LE Set Data Length (0x08|0x0022) plen 6 #31973 [hci0] 5281.478803 Handle: 1894 TX octets: 251 TX time: 2120

HCI Event: Command Complete (0x0e) plen 6 #31974 [hci0] 5281.479176 LE Set Data Length (0x08|0x0022) ncmd 1 Status: Unsupported Feature or Parameter Value (0x11) Handle: 1894

1
bluetooth-lowenergybluez

1 Answers

0
votes

turnes out I connected to Ipone 6s which does not support bluetooth 4.2 (it supports bluetooth 4.1). That was the reason for "Unsupported Feature" Meaning both master and slave must support bluetooth 4.2 (since data length extension is feature of bluetooth 4.2)