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Thu, 07 May 2026 22:38:24 -0700 (PDT) X-Received: by 2002:a17:902:c112:b0:2ba:11e2:6c1e with SMTP id d9443c01a7336-2ba7a3771eemr80000775ad.40.1778218703595; Thu, 07 May 2026 22:38:23 -0700 (PDT) Received: from hu-prathm-hyd.qualcomm.com ([202.46.23.25]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2baf1d2700dsm7944375ad.2.2026.05.07.22.38.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 May 2026 22:38:23 -0700 (PDT) From: Prathibha Madugonde X-Google-Original-From: Prathibha Madugonde To: linux-bluetooth@vger.kernel.org Cc: luiz.dentz@gmail.com, quic_mohamull@quicinc.com, quic_hbandi@quicinc.com, quic_anubhavg@quicinc.com Subject: [PATCH BlueZ v3] monitor: Parsing of cs step mode data in RAS Notifications Date: Fri, 8 May 2026 11:08:19 +0530 Message-Id: <20260508053819.3424918-1-prathm@qti.qualcomm.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-bluetooth@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Authority-Analysis: v=2.4 cv=DZUnbPtW c=1 sm=1 tr=0 ts=69fd76d1 cx=c_pps a=cmESyDAEBpBGqyK7t0alAg==:117 a=ZePRamnt/+rB5gQjfz0u9A==:17 a=NGcC8JguVDcA:10 a=s4-Qcg_JpJYA:10 a=VkNPw1HP01LnGYTKEx00:22 a=u7WPNUs3qKkmUXheDGA7:22 a=rJkE3RaqiGZ5pbrm-msn:22 a=EUspDBNiAAAA:8 a=W8hmDp5Yp52U6Zyi-J8A:9 a=1OuFwYUASf3TG4hYMiVC:22 X-Proofpoint-GUID: LTEgMx48Q4x-YILlMKKBQhVqi_ac0axM X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTA4MDA1MiBTYWx0ZWRfX45z2UH95fhtE r7k5XP4IrgEyGNDZI4NEVmnqmkhYORIkhsoVbB8duvV8tW42dXQJR+ywKwP37YljtTtbMHsPL0e DKnvxlO8GG1CZJN2cMNyuDhq246Bs8hy4OELMK5JAw4M73hMs3V2sH6E6Hzmf1VgZ+J+Zirkbtq n4xwa69f6BRx0uhAap1Ati2WBq27ZDiw1EYpoQIo7kDA+lPyuHh97vOAAHAl+GuvVC0PBtZIqix 9U3zjSeWTFsdtBlTkAx9VHkaBM3k36JpUEXOARY2dZjHBSqyateXw71Ojv84vX7+FiAyxZc/GtY wfUfZfQfLMxLZWst6Vq5ds1z3G5bLK0pmwVomZGrHzaFDKHG3EiqPxvKS+YjrdsC5ypQge0Njj1 g1TRUUrSPCrmw/AHmrVEptJ3Jb4pLGNJBCAhlOZoDqtLVPgvSVTcDm06SzF29H0z6LT98P5ccG4 X5ZXGda4uyyB0F3JoGw== X-Proofpoint-ORIG-GUID: LTEgMx48Q4x-YILlMKKBQhVqi_ac0axM X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-07_02,2026-05-06_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 lowpriorityscore=0 adultscore=0 suspectscore=0 bulkscore=0 malwarescore=0 priorityscore=1501 clxscore=1015 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604200000 definitions=main-2605080052 From: Prathibha Madugonde Sample Decoding Example: Subevent #0: Start ACL Connection Event: 406 Frequency Compensation: -16384 (0.01 ppm) Ranging Done Status: Partial results, more to follow (0x1) Subevent Done Status: All results complete (0x0) Ranging Abort Reason: No abort (0x0) Subevent Abort Reason: No abort (0x0) Reference Power Level: -14 dBm Number of Steps Reported: 58 Step 0 Mode Type: 0 Aborted: No Packet Quality: 0x00 CS Access Address check is successful Bit errors: 0 Packet RSSI: -52 Packet Antenna: 1 Step 1 Mode Type: 0 Aborted: No Packet Quality: 0x00 CS Access Address check is successful Bit errors: 0 Packet RSSI: -48 Packet Antenna: 1 Step 2 Mode Type: 1 Aborted: No Packet Quality: 0x00 CS Access Address check is successful Bit errors: 0 Packet NADM: Unknown NADM (0xff) Packet RSSI: -60 ToA_ToD: 0xffffff45 Packet Antenna: 1 Step 3 Mode Type: 1 Aborted: No Packet Quality: 0x00 CS Access Address check is successful Bit errors: 0 Packet NADM: Unknown NADM (0xff) Packet RSSI: -54 ToA_ToD: 0xffffff53 Packet Antenna: 1 --- monitor/att.c | 523 +++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 501 insertions(+), 22 deletions(-) diff --git a/monitor/att.c b/monitor/att.c index 03d46634f..278ac5675 100644 --- a/monitor/att.c +++ b/monitor/att.c @@ -4120,16 +4120,18 @@ static void print_ras_segmentation_header(uint8_t header) print_field(" Segment Index: %u", segment_index); } -static void print_ras_ranging_header(const struct l2cap_frame *frame) +static uint8_t print_ras_ranging_header(const struct l2cap_frame *frame) { uint16_t ranging_counter_config; uint8_t selected_tx_power; uint8_t antenna_paths_mask; uint8_t mask; + uint8_t num_antenna_paths = 0; + uint8_t i; if (!l2cap_frame_get_le16((void *)frame, &ranging_counter_config)) { print_text(COLOR_ERROR, " Ranging Header: invalid size"); - return; + return 0; } /* Lower 12 bits: Ranging Counter, Upper 4 bits: Configuration ID */ @@ -4140,14 +4142,14 @@ static void print_ras_ranging_header(const struct l2cap_frame *frame) if (!l2cap_frame_get_u8((void *)frame, &selected_tx_power)) { print_text(COLOR_ERROR, " Selected TX Power: invalid size"); - return; + return 0; } print_field(" Selected TX Power: %d dBm", (int8_t)selected_tx_power); if (!l2cap_frame_get_u8((void *)frame, &antenna_paths_mask)) { print_text(COLOR_ERROR, " Antenna Paths Mask: invalid size"); - return; + return 0; } print_field(" Antenna Paths Mask: 0x%2.2x", antenna_paths_mask); @@ -4157,6 +4159,14 @@ static void print_ras_ranging_header(const struct l2cap_frame *frame) if (mask) print_text(COLOR_WHITE_BG, " RFU (0x%2.2x)", mask); + + /* Count the number of set bits in antenna_paths_mask */ + for (i = 0; i < 4; i++) { + if (antenna_paths_mask & (1 << i)) + num_antenna_paths++; + } + + return num_antenna_paths; } static const char *ras_ranging_done_status_str(uint8_t status) @@ -4203,7 +4213,7 @@ static const char *ras_abort_reason_str(uint8_t reason) } } -static void print_ras_subevent_header(const struct l2cap_frame *frame) +static uint8_t print_ras_subevent_header(const struct l2cap_frame *frame) { uint16_t start_acl_conn_event; uint16_t freq_compensation; @@ -4216,7 +4226,7 @@ static void print_ras_subevent_header(const struct l2cap_frame *frame) if (!l2cap_frame_get_le16((void *)frame, &start_acl_conn_event)) { print_text(COLOR_ERROR, " Start ACL Connection Event: invalid size"); - return; + return 0; } print_field(" Start ACL Connection Event: %u", @@ -4225,7 +4235,7 @@ static void print_ras_subevent_header(const struct l2cap_frame *frame) if (!l2cap_frame_get_le16((void *)frame, &freq_compensation)) { print_text(COLOR_ERROR, " Frequency Compensation: invalid size"); - return; + return 0; } print_field(" Frequency Compensation: %d (0.01 ppm)", @@ -4233,7 +4243,7 @@ static void print_ras_subevent_header(const struct l2cap_frame *frame) if (!l2cap_frame_get_u8((void *)frame, &status_byte1)) { print_text(COLOR_ERROR, " Status: invalid size"); - return; + return 0; } ranging_done_status = status_byte1 & 0x0F; @@ -4248,7 +4258,7 @@ static void print_ras_subevent_header(const struct l2cap_frame *frame) if (!l2cap_frame_get_u8((void *)frame, &status_byte2)) { print_text(COLOR_ERROR, " Abort Reasons: invalid size"); - return; + return 0; } ranging_abort_reason = status_byte2 & 0x0F; @@ -4264,7 +4274,7 @@ static void print_ras_subevent_header(const struct l2cap_frame *frame) if (!l2cap_frame_get_u8((void *)frame, &ref_power_level)) { print_text(COLOR_ERROR, " Reference Power Level: invalid size"); - return; + return 0; } print_field(" Reference Power Level: %d dBm", @@ -4273,16 +4283,466 @@ static void print_ras_subevent_header(const struct l2cap_frame *frame) if (!l2cap_frame_get_u8((void *)frame, &num_steps_reported)) { print_text(COLOR_ERROR, " Number of Steps Reported: invalid size"); - return; + return 0; } print_field(" Number of Steps Reported: %u", num_steps_reported); + + return num_steps_reported; +} + +static const char *packet_quality_str(uint8_t quality) +{ + switch (quality & 0x03) { + case 0x00: + return "CS Access Address check is successful, and all bits " + "match the expected sequence"; + case 0x01: + return "CS Access Address check is successful, but some bits " + "do not match the expected sequence"; + case 0x02: + return "CS Access Address check failed"; + default: + return "Reserved"; + } +} + +static const char *tone_quality_str(uint8_t quality) +{ + switch (quality & 0x03) { + case 0x00: + return "Tone quality is high"; + case 0x01: + return "Tone quality is medium"; + case 0x02: + return "Tone quality is low"; + case 0x03: + return "Tone quality indication is not available"; + default: + return "Reserved"; + } +} + +static const char *tone_extension_str(uint8_t quality) +{ + switch ((quality >> 4) & 0x03) { + case 0x00: + return "Not tone extension slot"; + case 0x01: + return "Tone extension slot; tone not expected to be present"; + case 0x02: + return "Tone extension slot; tone expected to be present"; + default: + return "Reserved"; + } +} + +static void print_step_mode_0(const struct l2cap_frame *frame, uint8_t len) +{ + uint8_t quality, rssi, antenna; + uint16_t freq_offset; + + if (len < 3) { + print_hex_field(" Raw step data", frame->data, len); + return; + } + + if (!l2cap_frame_get_u8((void *)frame, &quality)) { + print_text(COLOR_ERROR, + " Packet Quality: invalid"); + return; + } + + print_field(" Packet Quality: 0x%02x", quality); + print_field(" %s", packet_quality_str(quality)); + print_field(" Bit errors: %u", (quality >> 2) & 0x3F); + + if (!l2cap_frame_get_u8((void *)frame, &rssi)) { + print_text(COLOR_ERROR, " Packet RSSI: invalid"); + return; + } + + print_field(" Packet RSSI: %d", (int8_t)rssi); + + if (!l2cap_frame_get_u8((void *)frame, &antenna)) { + print_text(COLOR_ERROR, + " Packet Antenna: invalid"); + return; + } + + print_field(" Packet Antenna: %u", antenna); + + if (len == 5) { + if (!l2cap_frame_get_le16((void *)frame, &freq_offset)) { + print_text(COLOR_ERROR, + " Measured Freq Offset: invalid size"); + return; + } + + print_field(" Measured Freq Offset: %d (0.01 ppm)", + (int16_t)freq_offset); + } +} + +static void print_step_mode_1(const struct l2cap_frame *frame, uint8_t len) +{ + uint8_t quality, nadm, rssi, antenna; + uint16_t toa_tod; + + if (len < 6) { + print_hex_field(" Raw step data", frame->data, len); + return; + } + + if (!l2cap_frame_get_u8((void *)frame, &quality)) { + print_text(COLOR_ERROR, " Packet Quality: invalid"); + return; + } + + print_field(" Packet Quality: 0x%02x", quality); + print_field(" %s", packet_quality_str(quality)); + print_field(" Bit errors: %u", (quality >> 2) & 0x3F); + + if (!l2cap_frame_get_u8((void *)frame, &nadm)) { + print_text(COLOR_ERROR, " Packet NADM: invalid"); + return; + } + + if (nadm == 0xFF) + print_field(" Packet NADM: Unknown NADM (0xff)"); + else + print_field(" Packet NADM: %u", nadm); + + if (!l2cap_frame_get_u8((void *)frame, &rssi)) { + print_text(COLOR_ERROR, " Packet RSSI: invalid"); + return; + } + + print_field(" Packet RSSI: %d", (int8_t)rssi); + + if (!l2cap_frame_get_le16((void *)frame, &toa_tod)) { + print_text(COLOR_ERROR, " ToA_ToD: invalid"); + return; + } + + print_field(" ToA_ToD: 0x%08x", toa_tod | 0xFFFF0000); + + if (!l2cap_frame_get_u8((void *)frame, &antenna)) { + print_text(COLOR_ERROR, " Packet Antenna: invalid"); + return; + } + + print_field(" Packet Antenna: %u", antenna); +} + +static void print_step_mode_2(const struct l2cap_frame *frame, uint8_t len, + uint8_t num_antenna_paths) +{ + uint8_t ant_perm_idx; + uint8_t i; + uint32_t pct; + uint16_t i_sample, q_sample; + uint8_t quality; + + if (len < 1) { + print_hex_field(" Raw step data", frame->data, len); + return; + } + + if (!l2cap_frame_get_u8((void *)frame, &ant_perm_idx)) { + print_text(COLOR_ERROR, " Antenna Permutation Index: " + "invalid size"); + return; + } + + print_field(" Antenna Permutation Index: %u", ant_perm_idx); + + /* Use the antenna paths count from ranging header */ + for (i = 0; i < (num_antenna_paths + 1); i++) { + if (frame->size < 4) { + print_text(COLOR_ERROR, + " Insufficient data for path %u", + i); + return; + } + + if (!l2cap_frame_get_le24((void *)frame, &pct)) { + print_text(COLOR_ERROR, " PCT: invalid"); + return; + } + + /* Extract 12-bit I and Q samples from 24-bit PCT */ + i_sample = pct & 0x0FFF; + q_sample = (pct >> 12) & 0x0FFF; + + print_field(" Path %u", i); + print_field(" PCT: 0x%06x", pct); + print_field(" I: 0x%03x", i_sample); + print_field(" Q: 0x%03x", q_sample); + + if (!l2cap_frame_get_u8((void *)frame, &quality)) { + print_text(COLOR_ERROR, + " Tone quality indicator: " + "invalid size"); + return; + } + + print_field(" Tone quality indicator: 0x%02x", + quality); + print_field(" %s (0x%02x)", + tone_quality_str(quality), + quality & 0x03); + print_field(" %s (0x%02x)", + tone_extension_str(quality), + (quality >> 4) & 0x03); + } +} + +static void print_step_mode_3(const struct l2cap_frame *frame, uint8_t len, + uint8_t num_antenna_paths) +{ + uint8_t quality, nadm, rssi, antenna; + uint16_t toa_tod; + uint8_t ant_perm_idx; + uint8_t i; + uint32_t pct; + uint16_t i_sample, q_sample; + uint8_t tone_quality; + + /* Mode 3 = Mode 1 (6 bytes) + Mode 2 (variable) */ + if (len < 6) { + print_hex_field(" Raw step data", frame->data, len); + return; + } + + /* Parse Mode 1 data first */ + if (!l2cap_frame_get_u8((void *)frame, &quality)) { + print_text(COLOR_ERROR, " Packet Quality: invalid"); + return; + } + + print_field(" Packet Quality: 0x%02x", quality); + print_field(" %s", packet_quality_str(quality)); + print_field(" Bit errors: %u", (quality >> 2) & 0x3F); + + if (!l2cap_frame_get_u8((void *)frame, &nadm)) { + print_text(COLOR_ERROR, " Packet NADM: invalid size"); + return; + } + + if (nadm == 0xFF) + print_field(" Packet NADM: Unknown NADM (0xff)"); + else + print_field(" Packet NADM: %u", nadm); + + if (!l2cap_frame_get_u8((void *)frame, &rssi)) { + print_text(COLOR_ERROR, " Packet RSSI: invalid size"); + return; + } + + print_field(" Packet RSSI: %d", (int8_t)rssi); + + if (!l2cap_frame_get_le16((void *)frame, &toa_tod)) { + print_text(COLOR_ERROR, " ToA_ToD: invalid size"); + return; + } + + print_field(" ToA_ToD: 0x%08x", toa_tod | 0xFFFF0000); + + if (!l2cap_frame_get_u8((void *)frame, &antenna)) { + print_text(COLOR_ERROR, " Packet Antenna: invalid"); + return; + } + + print_field(" Packet Antenna: %u", antenna); + + /* Now parse Mode 2 data */ + if (frame->size < 1) + return; + + if (!l2cap_frame_get_u8((void *)frame, &ant_perm_idx)) { + print_text(COLOR_ERROR, " Antenna Permutation Index: " + "invalid size"); + return; + } + + print_field(" Antenna Permutation Index: %u", ant_perm_idx); + + /* Use the antenna paths count from ranging header */ + for (i = 0; i < (num_antenna_paths + 1); i++) { + if (frame->size < 4) { + print_text(COLOR_ERROR, + " Insufficient data for path %u", + i); + return; + } + + if (!l2cap_frame_get_le24((void *)frame, &pct)) { + print_text(COLOR_ERROR, " PCT: invalid"); + return; + } + + /* Extract 12-bit I and Q samples from 24-bit PCT */ + i_sample = pct & 0x0FFF; + q_sample = (pct >> 12) & 0x0FFF; + + print_field(" Path %u", i); + print_field(" PCT: 0x%06x", pct); + print_field(" I: 0x%03x", i_sample); + print_field(" Q: 0x%03x", q_sample); + + if (!l2cap_frame_get_u8((void *)frame, &tone_quality)) { + print_text(COLOR_ERROR, + " Tone quality indicator: " + "invalid size"); + return; + } + + print_field(" Tone quality indicator: 0x%02x", + tone_quality); + print_field(" %s (0x%02x)", + tone_quality_str(tone_quality), + tone_quality & 0x03); + print_field(" %s (0x%02x)", + tone_extension_str(tone_quality), + (tone_quality >> 4) & 0x03); + } +} + +static void print_ranging_steps(const struct l2cap_frame *frame, + uint8_t num_steps, uint8_t num_antenna_paths) +{ + uint8_t step_idx; + + for (step_idx = 0; step_idx < num_steps && frame->size > 0; + step_idx++) { + uint8_t mode_byte; + uint8_t mode_type; + bool aborted; + uint8_t step_data_len; + + if (!l2cap_frame_get_u8((void *)frame, &mode_byte)) { + print_text(COLOR_ERROR, + " Step %u: Mode: invalid size", + step_idx); + return; + } + + mode_type = mode_byte & 0x03; + aborted = (mode_byte & 0x80) != 0; + + print_field(" Step %u", step_idx); + print_field(" Mode Type: %u", mode_type); + print_field(" Aborted: %s", aborted ? "Yes" : "No"); + + /* If aborted, step data length is 0 */ + if (aborted) + continue; + + /* Determine step data length based on mode type + * Mode 0: Check if we have 5 bytes (initiator) or 3 bytes + * (reflector) + * Mode 1: Always 6 bytes + * Mode 2: 1 byte (ant_perm_idx) + num_antenna_paths * 4 bytes + * Mode 3: 6 bytes (Mode 1) + 1 byte (ant_perm_idx) + + * num_antenna_paths * 4 bytes + */ + switch (mode_type) { + case 0: + /* Mode 0: Default to 3 bytes (reflector) + * Only use 5 bytes if we're the last step AND have + * exactly 5 bytes remaining + */ + if (step_idx == num_steps - 1 && frame->size == 5) { + /* Initiator - last step with exactly 5 bytes */ + step_data_len = 5; + } else if (frame->size >= 3) { + /* Reflector - default case */ + step_data_len = 3; + } else { + print_text(COLOR_ERROR, + " Insufficient data for Mode 0"); + return; + } + break; + case 1: + /* Mode 1: Always 6 bytes */ + if (frame->size < 6) { + print_text(COLOR_ERROR, + " Insufficient data for Mode 1"); + return; + } + step_data_len = 6; + break; + case 2: + /* Mode 2: 1 byte antenna + num_antenna_paths * 4 + * bytes per path + */ + step_data_len = 1 + ((num_antenna_paths + 1) * 4); + if (frame->size < step_data_len) { + print_text(COLOR_ERROR, + " Insufficient data for Mode 2 (need %u)", + step_data_len); + return; + } + break; + case 3: + /* Mode 3: 6 bytes Mode 1 + 1 byte antenna + + * num_antenna_paths * 4 bytes + */ + step_data_len = 7 + ((num_antenna_paths + 1) * 4); + if (frame->size < step_data_len) { + print_text(COLOR_ERROR, + " Insufficient data for Mode 3 (need %u)", + step_data_len); + return; + } + break; + default: + print_text(COLOR_ERROR, " Unknown mode type"); + return; + } + + if (step_data_len > frame->size) { + print_text(COLOR_ERROR, + " Invalid step data length"); + return; + } + + if (step_data_len > 0) { + struct l2cap_frame step_frame; + + l2cap_frame_clone(&step_frame, frame); + step_frame.size = step_data_len; + + switch (mode_type) { + case 0: + print_step_mode_0(&step_frame, step_data_len); + break; + case 1: + print_step_mode_1(&step_frame, step_data_len); + break; + case 2: + print_step_mode_2(&step_frame, step_data_len, + num_antenna_paths); + break; + case 3: + print_step_mode_3(&step_frame, step_data_len, + num_antenna_paths); + break; + } + + if (!l2cap_frame_pull((void *)frame, frame, + step_data_len)) + return; + } + } } static void ras_ranging_data_read(const struct l2cap_frame *frame) { uint8_t seg_header; - bool first_segment; + bool first_segment = true; if (!l2cap_frame_get_u8((void *)frame, &seg_header)) { print_text(COLOR_ERROR, " Segmentation Header: invalid size"); @@ -4292,26 +4752,45 @@ static void ras_ranging_data_read(const struct l2cap_frame *frame) print_ras_segmentation_header(seg_header); first_segment = seg_header & 0x01; - /* Only try to decode headers if this is the first segment */ - if (first_segment && frame->size >= 6) { + if (first_segment && frame->size >= 4) { + uint8_t num_steps; + uint8_t num_antenna_paths; + print_field(" Ranging Data Body:"); - print_ras_ranging_header(frame); + num_antenna_paths = print_ras_ranging_header(frame); /* Try to decode subevent header if enough data remains */ - if (frame->size >= 10) { + if (frame->size >= 8) { print_field(" Subevent #0:"); - print_ras_subevent_header(frame); + num_steps = print_ras_subevent_header(frame); + + /* Parse steps if we have num_steps and + * num_antenna_paths + */ + if (num_steps > 0 && num_antenna_paths > 0 && + frame->size > 0) { + print_ranging_steps((void *)frame, num_steps, + num_antenna_paths); + } } + } else if (!first_segment && frame->size > 0) { + /* For continuation segments, we cannot reliably decode without + * full segment reassembly, as steps may be split across + * segments. + * Just show the raw data. + */ + print_field(" Continuation Segment (raw data - requires " + "reassembly for proper decoding):"); + print_hex_field(" Segment Data", frame->data, frame->size); } - if (frame->size > 0) { - print_hex_field(" Remaining Ranging Data Segment", frame->data, - frame->size); - } + if (frame->size > 0 && first_segment) + print_hex_field(" Remaining Ranging Data Segment", + frame->data, frame->size); done: - if (frame->size) + if (frame->size && first_segment) print_hex_field(" Remaining Data", frame->data, frame->size); } -- 2.34.1