A value characteristic can only receive 2 bytes of payload?

RE: A value characteristic can only receive 2 bytes of payload?

Petter Myhre — Tue, 27 Dec 2016 09:25:25 GMT

So sometimes you get len 2 and sometimes you get len 5 on the same handle, 0x000E? Then I don't think it's something wrong with the firmware on the nRF. Maybe a sniffer trace would provide some more information. You can use the nRF Sniffer.

RE: A value characteristic can only receive 2 bytes of payload?

Mitch996 — Sun, 25 Dec 2016 09:10:37 GMT

Update: the android api is tailoring properly to the length of my packets. (at least according to the breakpoint I just did) It "worked" again, until, of course, it doesn't. Damn I hate this game.

RE: A value characteristic can only receive 2 bytes of payload?

Mitch996 — Sun, 25 Dec 2016 09:03:47 GMT

Well what do you know! the len is 0x0002. I'm not coming ON to ya but you got help me out here — what are the things that may affect this property? I send this from an android phone. I thought the length is automatically configured by android apis, no? Here's a link to the breakpoint-pause image: link text

RE: A value characteristic can only receive 2 bytes of payload?

Petter Myhre — Fri, 23 Dec 2016 13:06:14 GMT

You shois uld be able to write more than 5 as long as sizeof(mesh_gatt_evt_t) more than 5. Strange that you are getting different values. Are you sure that you the write events you get are to the same attribute? You can check the attribute handle. Maybe add something like this to ble_evt_dispatch():

if(p_ble_evt->header.evt_id == BLE_GATTS_EVT_WRITE) 
{
    printf("Write event with handle: %#04x\r\n", p_ble_evt->evt.gatts_evt.params.write.handle);
    printf("Write event with length: %#04x\r\n", p_ble_evt->evt.gatts_evt.params.write.len);
    printf("Write event with data:");
    for(uint32_t i = 0; i < p_ble_evt->evt.gatts_evt.params.write.len-1; i++)
    {
        printf("%#02x, ", p_ble_evt->evt.gatts_evt.params.write.data[i]);
    }
    printf("%#02x\r\n", p_ble_evt->evt.gatts_evt.params.write.data[p_ble_evt->evt.gatts_evt.params.write.len-1]);
}