Operating system name and version: Window 10 64Bit
Version of smsd: 3.1.21
Smsd installed from: sources
Name and model of a modem / phone: EC200T Mini PCI-E
Interface:USB

I'm facing issue when read SMS using this modem, with the message below:

Error: Cannot decode PDU, see text part for details.
From:
From_TOA: 18 international, national
Received: 20-05-15 05:29:34
Subject: GSM1
Modem: GSM1
IMSI: 510101562507905
IMEI: 867881043595334
Report: no
Alphabet: ISO
Length: 479
UDH: no
PDU: 06912618014000040d91261823602316f000000250515082548204c820f309
Pos: ....-....*....-.^^~here(17)

First tried with PDU mode new (with CSA):
PDU ERROR: Position 17,2: Invalid sender address length: "0d"

Next tried with PDU mode old (without CSA):
PDU ERROR: Position 7,2: Missing bit 7 in recipient address type: "18"

No success. This PDU cannot be decoded. There is something wrong

Could you help this problem?

This is log info
... 2020-05-15 05:29:33,6, GSM1: Checking device for incoming SMS 2020-05-15 05:29:33,6, GSM1: Checking if modem is ready 2020-05-15 05:29:33,7, GSM1: -> AT 2020-05-15 05:29:33,7, GSM1: Command is sent, waiting for the answer. (5) 2020-05-15 05:29:33,7, GSM1: <- OK 2020-05-15 05:29:33,6, GSM1: Pre-initializing modem 2020-05-15 05:29:33,7, GSM1: -> ATE0 2020-05-15 05:29:33,7, GSM1: Command is sent, waiting for the answer. (10) 2020-05-15 05:29:34,7, GSM1: <- OK 2020-05-15 05:29:34,7, GSM1: -> AT+CMEE=1;+CREG=2 2020-05-15 05:29:34,7, GSM1: Command is sent, waiting for the answer. (10) 2020-05-15 05:29:34,7, GSM1: <- OK 2020-05-15 05:29:34,7, GSM1: -> AT+CSQ 2020-05-15 05:29:34,7, GSM1: Command is sent, waiting for the answer. (10) 2020-05-15 05:29:34,7, GSM1: <- +CSQ: 26,99 OK 2020-05-15 05:29:34,6, GSM1: Signal Strength Indicator: (26,99) -61 dBm (Excellent), Bit Error Rate: not known or not detectable 2020-05-15 05:29:34,6, GSM1: Checking if Modem is registered to the network 2020-05-15 05:29:34,7, GSM1: -> AT+CREG? 2020-05-15 05:29:34,7, GSM1: Command is sent, waiting for the answer. (10) 2020-05-15 05:29:34,7, GSM1: <- +CREG: 2,1,"07EB","6916818",7 OK 2020-05-15 05:29:34,6, GSM1: Modem is registered to the network 2020-05-15 05:29:34,6, GSM1: Selecting PDU mode 2020-05-15 05:29:34,7, GSM1: -> AT+CMGF=0 2020-05-15 05:29:34,7, GSM1: Command is sent, waiting for the answer. (5) 2020-05-15 05:29:34,7, GSM1: <- OK 2020-05-15 05:29:34,6, GSM1: Checking memory size 2020-05-15 05:29:34,7, GSM1: -> AT+CPMS? 2020-05-15 05:29:34,7, GSM1: Command is sent, waiting for the answer. (5) 2020-05-15 05:29:34,7, GSM1: <- +CPMS: "ME",1,180,"ME",1,180,"ME",1,180 OK 2020-05-15 05:29:34,6, GSM1: Used memory is 1 of 180 2020-05-15 05:29:34,6, GSM1: Trying to get stored message 0 2020-05-15 05:29:34,7, GSM1: -> AT+CMGR=0 2020-05-15 05:29:34,7, GSM1: Command is sent, waiting for the answer. (5) 2020-05-15 05:29:34,7, GSM1: <- +CMGR: 0,,24 06912618014000040d91261823602316f000000250515082548204c820f309 OK 2020-05-15 05:29:34,5, GSM1: SMS received, From: 2020-05-15 05:29:34,6, GSM1: Wrote an incoming message file: /var/spool/sms/incoming/GSM1.tqYHja 2020-05-15 05:29:34,6, GSM1: Deleting message 0 2020-05-15 05:29:35,7, GSM1: -> AT+CMGD=0 2020-05-15 05:29:35,7, GSM1: Command is sent, waiting for the answer. (5) 2020-05-15 05:29:37,7, GSM1: <- OK 2020-05-15 05:29:37,6, GSM1: Checking device for incoming SMS 2020-05-15 05:29:37,6, GSM1: Checking memory size 2020-05-15 05:29:37,7, GSM1: -> AT+CPMS? 2020-05-15 05:29:37,7, GSM1: Command is sent, waiting for the answer. (5) 2020-05-15 05:29:37,7, GSM1: <- +CPMS: "ME",0,180,"ME",0,180,"ME",0,180 OK 2020-05-15 05:29:37,6, GSM1: Used memory is 0 of 180 2020-05-15 05:29:37,6, GSM1: No SMS received 2020-05-15 05:29:44,2, smsd: Smsd mainprocess is awaiting the termination of all modem handlers. PID: 5700. 2020-05-15 05:29:44,2, GSM1: Modem handler 0 terminated. PID: 11812, was started 20-05-15 05:28:20, up 1 min. ...

Any help greatly apreciated.

Thanks

Please apply this patch:

Edit the pdu.c and search for "memory reading".

Add those three highlighted lines as shown:



Then save, recompile and test.

Hi keke...

It's done. Nice.

Thank you for your time and valuable feedback.