Bluetooth sending and receiving data too large requires subcontracting-packet processing

{static unsigned char bt_rxdata_merge_status=bt_rxdata_merge_defaul_status;//means an IAP packet is sent by a bt_rxdata if (bt_ Rxdata_merge_status==bt_rxdata_merge_defaul_status && 0x55==bt_rxdata->msgdata[2]) {//detect the length of the IAP packet First// IAP packet: Length field data contains 1 or 3 bytes, depending on the length of the payload//one-byte domain can behave in a single byte 0x02 to 0xFC (2 to 252) load length//Three bytes field data contains 0x00 tag bytes, 2 bytes payload Length field values followed immediately, range from 0X00FD to 0xFFFA (253 to 65529). if (0x00! = bt_rxdata->msgdata[3])//IAP length is single byte {//parsing IAP data bt_iap_cmdlist_typedef * Iap_data = (bt_iap_cmdlist_ TYPEDEF *) malloc (sizeof (BT_IAP_CMDLIST_TYPEDEF)); if (iap_data==null) {return;} memset (iap_data, 0, sizeof (bt_iap_cmdlist_typedef)); Iap_data->len = Bt_rxdata->msgdata[3];iap_data->lingo _id = bt_rxdata->msgdata[4];iap_data->command_id = bt_rxdata->msgdata[5];iap_data->trans_id = (Bt_ RXDATA-&GT;MSGDATA[6] << 8) | (Bt_rxdata->msgdata[7] & 0xff);//bt_rxdata->msglength=start+len+lingo_id+command_id+trans_id+checksum+ paybufmemcpy (Iap_data->rece_buf, & (Bt_rxdata->msgdata[8]), bt_rxdata->MSGDATA[1]-7);//Insert a complete IAP data into the linked list bt_iapcommand_cmdlistinsertcmd (iap_data);//IAP authentication starts processing the EA Channel if ( Getcurbtiapauthenticatedstatus () ==bt_iap_success) {iap_packet_deal ();}       Reset bt_rxdata_merge_status flag bit bt_rxdata_merge_status=bt_rxdata_merge_defaul_status;} else if (0x00==bt_rxdata->msgdata[3])//IAP has a length of three bytes and is marked with 0x00, and the last two bytes are the lengths of the IAP, which is obviously greater than the maximum length of bt_rxdata of 256, Need to subcontract {iap_point = 0;memset (iap_payloadbuf, 0, max_iap_data_buffer);//bt_rxdata->msgdata[1]=start+len+lingo_id+ Command_id+trans_id+checksum+paybuf//0x99 after the opening of the user data length//Save the length of the IAP Packet iap_data_len= (Bt_rxdata->msgdata[4] < < 8) | (Bt_rxdata->msgdata[5] & 0xff); memcpy (Iap_payloadbuf + iap_point, & (Bt_rxdata->msgdata[2]), bt_rxdata- &GT;MSGDATA[1]); iap_point=iap_point+bt_rxdata->msgdata[1];//reset the bt_rxdata_merge_status flag bit requires a subcontracting process Bt_rxdata_ Merge_status=bt_rxdata_merge_middle_status;}} else if (bt_rxdata_merge_status==bt_rxdata_merge_middle_status) {memcpy (Iap_payloadbuf + iap_point, & (Bt_RxData- &GT;MSGDATA[2]), BT_RXDATA-&GT;MSGDATA[1]); iap_point=iap_point+bt_rxdata->msgdata[1];//compare whether the cached data is already able to form a complete IAP packet if ((IAP_ POINT-5) >=iap_data_len) {//iap_point=iap_data_len+sizeof (start) +sizeof (len) +sizeof (checksum) =iap_data_len+5/ /Parse IAP data bt_iap_cmdlist_typedef * iap_data = (Bt_iap_cmdlist_typedef *) malloc (sizeof (BT_IAP_CMDLIST_TYPEDEF)); if (IAP _data==null) {return;} memset (iap_data, 0, sizeof (bt_iap_cmdlist_typedef)); Iap_data->len = (iap_payloadbuf[2] << 8) | (Iap_payloadbuf[3] & 0xff); iap_data->lingo_id =iap_payloadbuf[4];iap_data->command_id = iAP_PayLoadBuf[5] ; iap_data->trans_id = (Iap_payloadbuf[6] << 8) | (Iap_payloadbuf[7] & 0xff);//bt_rxdata->msglength=start+len+lingo_id+command_id+trans_id+checksum+ paybufmemcpy (Iap_data->rece_buf, & (Iap_payloadbuf[8]), iap_point-9);//Insert a complete IAP data into the list Bt_iapcommand_ Cmdlistinsertcmd (iap_data);//IAP authentication starts processing the EA Channel if (Getcurbtiapauthenticatedstatus () ==bt_iap_success) {iap_packet_ Deal ();} Reset the BT_RXDATA_MERGE_STATUS flag bit to initialize the state of BT_rxdata_merge_status=bt_rxdata_merge_defaul_status;} else if ((iap_point-5) <iap_data_len) {//Reset the BT_RXDATA_MERGE_STATUS flag bit requires a subcontracting process Bt_rxdata_merge_status=bt_rxdata_ merge_middle_status;//packet processing Count iap_merge_test++;}}}

Bluetooth sending and receiving data too large requires subcontracting-packet processing