RE: gatt_init procedure prevents long write SDK14.2

yacine — Thu, 10 Jan 2019 11:38:06 GMT

dear community, I found my bug which was not related to MTU or paylod size. the treatment of the data was the reason (error in the write_handler)

RE: gatt_init procedure prevents long write SDK14.2

yacine — Tue, 08 Jan 2019 19:00:17 GMT

android message says :

onClientConnectionState() - status=8

RE: gatt_init procedure prevents long write SDK14.2

yacine — Tue, 08 Jan 2019 17:01:06 GMT

is there some delay timeout that is triggered if the write operation take too long ?

RE: gatt_init procedure prevents long write SDK14.2

yacine — Tue, 08 Jan 2019 12:15:46 GMT

this happens at connection establishment: I set both server and client mtu to 247 and it seems to be ok. only very small packets are recevived correctly. other lead to a disconnect that I can see in the android log (no pertinent info, just the peripheral has disconnected for this write....)

<debug> thc_ble_tds: [TDS] GAP Connected.
<debug> ble_gatt: Requesting to update ATT MTU to 247 bytes on connection 0x0.
<debug> ble_gatt: Requesting to update data length to 251 on connection 0x0.
<info> thc_ble_app: [APP] Connection established.
<debug> ble_gatt: ATT MTU updated to 247 bytes on connection 0x0 (response).
<debug> thc_ble_app: [APP] MTU updated
<debug> ble_gatt: Data length updated to 251 on connection 0x0.
<debug> ble_gatt: max_rx_octets: 27
<debug> ble_gatt: max_tx_octets: 251
<debug> ble_gatt: max_rx_time: 328
<debug> ble_gatt: max_tx_time: 2120
<debug> thc_ble_app: [APP] MTU unchanged
<info> thc_ble_app: [APP] LLData Channel PDU payload length updated.
<info> thc_ble_app: [APP] Connection Parameters updated.
<debug> ble_gatt: Peer on connection 0x0 requested a data length of 27 bytes.
<debug> ble_gatt: Updating data length to 27 bytes on connection 0x0.
<info> thc_ble_app: [APP] Data Length Update Request.
<debug> ble_gatt: Data length updated to 251 on connection 0x0.
<debug> ble_gatt: max_rx_octets: 27
<debug> ble_gatt: max_tx_octets: 251
<debug> ble_gatt: max_rx_time: 328
<debug> ble_gatt: max_tx_time: 2120
<debug> thc_ble_app:[APP] MTU unchanged
<info> thc_ble_app: [APP] LL Data Channel PDU payload length updated.
<debug> ble_gatt: Peer on connection 0x0 requested an ATT MTU of 247 bytes.
<debug> ble_gatt: Updating ATT MTU to 247 bytes (desired: 247) on connection 0x0.
<debug> thc_ble_app: [APP] MTU updated
<info> thc_ble_app: [APP] Connection Parameters updated.
<debug> ble_gatt: Peer on connection 0x0 requested a data length of 251 bytes.
<debug> ble_gatt: Updating data length to 251 bytes on connection 0x0.
<info> thc_ble_app: [APP] Data Length Update Request.
<debug> ble_gatt: Data length updated to 251 on connection 0x0.
<debug> ble_gatt: max_rx_octets: 251
<debug> ble_gatt: max_tx_octets: 251
<debug> ble_gatt: max_rx_time: 2120
<debug> ble_gatt: max_tx_time: 2120