If i want to change MTU size(23 by default) , exchange mtu req from client(cellphone) is necessary.
can i send this req from server to client (cellphone)?
Device:
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Hi bigheadbaby,
You should configure the CFG_MAX_RX_PACKET_LENGTH and CFG_MAX_TX_PACKET_LENGTH definitions of da1458x_config_advanced.h header file with the correct DLE packet. Then you should modify the .max_txoctets and the .max_txtime of the user_gapm_conf structure of the user_config.h header file. Also, you should use the MTU size .max_mtu = 60. Also, I highly suggest you the DSPS application for the DA14585 SoC. This application uses the data length extension(DLE). Please search the USE_DLE hash definition.
Thanks, PM_Dialog
Dear PM_Dialog:
thanks for your reply .
But im still comfused for the initiator of this process.
I have successfully use NORDIC NRF connect to send mtu exchange to enlarge size of mtu.
but can i sent this req from NORDIC SOC? for example, after finishing connection with the cellphone , i want to set a ke_timer to trigger a api to send a ext_mtu req to cellphone to set mtu size , is there any API can I use for starting this process?
谢谢~
Hi bigheadbaby,
Since its a 580 you can set the maximum MTU size in the user_gapm_conf struct in the .max_mtu member of the structure, after doing that in order to perform the exchange with the central you should send the GATTC_EXC_MTU_CMD when you have a connection (in the user_on_connection) and the 580 will perform the exchange. There is no API implemented that does this but you can use the snippet below:
static void user_gattc_exc_mtu_cmd(uint8_t conidx)
{
struct gattc_exc_mtu_cmd * cmd = KE_MSG_ALLOC(GATTC_EXC_MTU_CMD,
KE_BUILD_ID(TASK_GATTC, conidx), TASK_APP,
gattc_exc_mtu_cmd);
cmd->req_type = GATTC_MTU_EXCH;
ke_msg_send(cmd);
}
Thanks MT_dialog