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Commit bf2260c4 authored by Łukasz Rymanowski's avatar Łukasz Rymanowski
Browse files

bta_gattc_cache: Use GATT caching for devices with LMP version 5.1 

This is a workaround for devices which are on the market and does not
like Androids Database hash read.

With this patch, Android requires LMP version 5.1 to read Database hash.

Bug: 241324007
Test: Manual testes with devices with different LMP version
Test: atest BluetoothInstrumentationTests
Tag: #feature
Change-Id: If48656d7eac5daeb1d7befce921270c1911b45e2
parent 9c3630f6

system/bta/gatt/bta_gattc_act.cc

+20 −0
Original line number Diff line number Diff line
@@ -768,6 +768,26 @@ void bta_gattc_start_discover(tBTA_GATTC_CLCB* p_clcb, 
      p_clcb->p_srcb->update_count = 0;

      p_clcb->p_srcb->state = BTA_GATTC_SERV_DISC_ACT;



      /* This is workaround for the embedded devices being already on the market

       * and having a serious problem with handle Read By Type with

       * GATT_UUID_DATABASE_HASH. With this workaround, Android will assume that

       * embedded device having LMP version lower than 5.1 (0x0a), it does not

       * support GATT Caching.

       */

      uint8_t lmp_version = 0;

      if (!BTM_ReadRemoteVersion(p_clcb->bda, &lmp_version, nullptr, nullptr)) {

        LOG_WARN("Could not read remote version for %s",

                 p_clcb->bda.ToString().c_str());

      }



      if (lmp_version < 0x0a) {

        LOG_WARN(

            " Device LMP version 0x%02x < Bluetooth 5.1. Ignore database cache "

            "read.",

            lmp_version);

        p_clcb->p_srcb->srvc_hdl_db_hash = false;

      }



      /* read db hash if db hash characteristic exists */

      if (bta_gattc_is_robust_caching_enabled() &&

          p_clcb->p_srcb->srvc_hdl_db_hash &&