[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```

1 files changed, 16 insertions, 0 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 {