[MTX-3102] mPower Feb20: IN:3899 MTCDT-LVW3 fails SMS with GUI

Fixed the logic for parsing single-part and multi-part messages for LVW3 and LNA3.
Now single-part messages should be parsed as correctly as multi-part messages.

This logic improves the logic that were previously implemented in with multi-part messages
support for LVW2: bbf6ae9b1790c7129bf249641350b302def3ee27.

What changed:

- CDMA-specific SMS Teleservice ID is now saved as part of the PDU structure
- SMS Teleservice ID is now used to determine if the message
  CDMA Wireless Enhanced Messaging Teleservice (WEMT) with an actual UDH header
- UDH headers are used for multi-part messages in LVW3/LNA3

Why changed:

- UDH header may NOT be present in the SMS PDU
- first byte of user data may be a letter instead of the UDH header size
- when letter is parsed as side we get a lot of issues with
  segmentation faults, parsing issues, garbage in payload and so on
- so this commit adds SMS type detection before actual UDH header parsing attempt is performed

Sources for implementation:

- Telit LE910 V2 SERIES AT COMMANDS REFERENCE GUIDE 80446ST10707A Rev.3,
  section 5.1.5.5.7 Read Message (3GPP2) - +CMGR contains definition of Teleservice ID
  field and four of the types: 4097 page, 4098 SMS (0x1002), 4099 voice mail,
  262144 voice mail notification
- 3GPP2 X.S0004-550-E, section 2.256 SMS_TeleserviceIdentifier contains definition for
  additional SMS types including 4101 (0x1005) CDMA Wireless Enhanced Messaging Teleservice (WEMT).
- Teleservice ID 0x1002 is actually used for short messages in Verizon:
  ```+CMGL: 12,1,"",23

098010310REDACTED4F3 191213 050558 1002 0009 0C D4F29C0E32CBDF6D503508```

- Teleservice ID 0x1005 is actually used for multi-part messages in Verizon:
  ```+CMGL: 13,1,"",152
098010310REDACTED4F3 191213 050741 1005 0009 A0 05 00 03 4A 02 01 CC 66B3D96C369BCD66B3D96C369BCDE6E3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCFE7F3F97C3E9FCF

+CMGL: 14,1,"",143
098010310REDACTED4F3 191213 050743 1005 0009 95 05 00 03 4A 02 02 CE E7F3F97C3E9FCFE7F3F97C3E9FCFE7B3D96C369BCD66B3D96C369BCD66B3D96C369BCDE670381C0E87C3E170381C0E87C3E170381C0E87C3E170381C0E87C3E170381C0E87C3E170381C0E87C3E170381C0E87C3E170381C0E87C3E170381C0E87C3E170381C0E87C3E17038168BC562B1582C168BC562B1582C1603```

3 files changed, 32 insertions, 2 deletions

diff --git a/src/pdu.h b/src/pdu.h
index 5b4eb15..dea429a 100644
--- a/src/pdu.h
+++ b/src/pdu.h
@@ -60,6 +60,21 @@ enum {
 	PDU_ALPHABET_DEFAULT_MULTI = 9,//no GSM,     LVW2 7-bit, multi-part
 };
 
+// CDMA Teleservice Identifiers (what type of message is received in CDMA network)
+// All such identifiers are described in 3GPP2 X.S0004-550-E, section 2.256 SMS_TeleserviceIdentifier
+enum {
+	PDU_TELE_ID_UNUSED = 0,  // Not used.
+	// 1 - Reserved for maintenance.
+	// 2 through 4095 - Reserved for assignment by MAP.
+	// ...
+	PDU_TELE_ID_CDMA_PAGE = 4097,  // CDMA Cellular Paging Teleservice.
+	PDU_TELE_ID_CDMA_MSG = 4098,  // CDMA Cellular Messaging Teleservices.
+	PDU_TELE_ID_CDMA_VOICE_MSG_NOTIF = 4099,  // CDMA Voice Mail Notification
+	// ...
+	PDU_TELE_ID_CDMA_WEMT = 4101  // CDMA Wireless Enhanced Messaging Teleservice (WEMT).
+	// ...
+};
+
 struct pdu_info {
 	int msg_len;
 	struct pdu_addr smsc_addr;
@@ -77,6 +92,7 @@ struct pdu_info {
 	} type;
 	uint8_t msg_reference;
 	uint8_t protocol_id;
+	uint16_t teleservice_id;  // CDMA-specific, see 3GPP2 X.S0004-550-E for details
 	union {
 		uint8_t data_coding;
 		struct {
diff --git a/src/pdu_decode.c b/src/pdu_decode.c
index d67d5c3..9c0ced5 100644
--- a/src/pdu_decode.c
+++ b/src/pdu_decode.c
@@ -290,11 +290,15 @@ int pdu_decode_user_data(const char *pdu_str, struct pdu_info *pdu, int *nr_octe
       (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT2) ||
       (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT_MULTI)||
       (pdu->data_coding.general.alphabet == PDU_ALPHABET_TE)) {
-    // Keep UDH for concatenated SMS.
+    // Keep UDH for concatenated SMS ONLY.
     // Otherwise it is impossible to process correctly concatenated SMS.
     i = 0;
     if (pdu->type.user_data_header ||
-        (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT_MULTI)) {
+        // For LVW3, LNA3 and LVW2 - Save header ONLY when it's actually a multi-part message.
+        // Multi-part messages should use Teleservice ID 4101 (0x1005) in LVW2 7-BIT MULTI-PART format.
+        // See 3GPP2 X.S0004-550-E for details on Teleservice ID.
+        (pdu->data_coding.general.alphabet == PDU_ALPHABET_DEFAULT_MULTI
+         && pdu->teleservice_id == PDU_TELE_ID_CDMA_WEMT)) {
       for (i = 0; i <= octets[0]; ++i) {
         pdu->user_data[i] = octets[i];
       }
@@ -536,11 +540,17 @@ int pdu_decode_cdma(const char *pdu_str, struct pdu_info *pdu)
   pdu_str += HEX_BYTE_LEN;
   log_debug("tele-id-1: 0x%02X", tmp);
 
+  pdu->teleservice_id = 0;
+  pdu->teleservice_id |= (tmp << 8);  // save upper byte of the Teleservice ID
+
   tmp = hex_byte_decode(pdu_str);
   DECODE_FAIL(tmp < 0, "tele-id-2", -1);
   pdu_str += HEX_BYTE_LEN;
   log_debug("tele-id-2: 0x%02X", tmp);
 
+  pdu->teleservice_id |= (tmp);  // save lower byte of the Teleservice ID
+  log_debug("tele-id: 0x%04X", pdu->teleservice_id);
+
   //Priority
   tmp = hex_byte_decode(pdu_str);
   DECODE_FAIL(tmp < 0, "priority", -1);
diff --git a/src/sms_list.c b/src/sms_list.c
index dcad3fe..678c158 100644
--- a/src/sms_list.c
+++ b/src/sms_list.c
@@ -178,6 +178,10 @@ static int print_list_yaml(struct msg_list_info *list_info)
 		indentf(indent, "protocol-id: 0x%02X\n", msg->pdu.protocol_id);
 
 		if (Global.core.verbose) {
+			indentf(indent, "tele-id: 0x%04X\n", msg->pdu.teleservice_id);
+		}
+
+		if (Global.core.verbose) {
 			indentf(indent, "addr-length: 0x%02X\n", msg->pdu.addr.len);
 		}
 		indentf(indent, "addr-type: 0x%02X\n", msg->pdu.addr.type);