Hello, I am using Telit HE910 modem, the version of firmware is 12.00.03. Sometimes, the modem port got stuck after sending AT+CGDCONT=1. (Such as AT+CGDCONT=1,"IP","internet.tele2.se"). When this problem happened, I could not get any information from the modem port after this command.. The following was the situation when this problem happened Aux: > AT+CRSM=192,28621\r Modem: > AT+CGDCONT=1,"IP","internet.tele2.se"\r Modem: < AT+CGDCONT=1,"IP","internet.tele2.se"\r Aux: < \r\n+CME ERROR: 4\r\n According to Telit AT Commands Reference Guide: /3.2.5. Command Issuing Timing/ /The chain Command -> Response shall always be respected and a new command must not be// //issued before the module has terminated all the sending of its response result code (whatever it// //may be)./ It seems that this problem is caused by "Command Issuing TIming" Since there were alway some pending responses on the AUX port when this problem happened. and there was no pending response on the AUX port when it worked. when it worked: Aux: > AT+CRSM=192,28621\r Aux: < \r\n+CME ERROR: 4\r\n Aux: > AT+CRSM=192,28437\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n drivers/atmodem/gprs-context.c:at_gprs_activate_primary() cid 1 Modem: > AT+CGDCONT=1,"IP","internet.tele2.se"\r Modem: < AT+CGDCONT=1,"IP","internet.tele2.se"\r\r\nOK\r\n I added sleep(1) just before sending out AT+CGDCONT=1,"IP","internet.tele2.se command. It worked well. I know this is a bad idea. If this problem is really caused by "Command Issuing TIming", How should we solve or work around this problem? Thanks. Mingli The following is trace log. Aux: > ATE0 +CMEE=1\r Aux: < ATE0 +CMEE=1\r\r\nOK\r\n Aux: > AT#QSS=0\r Aux: < \r\nOK\r\n Aux: > AT+CFUN=1\r Aux: < \r\nOK\r\n plugins/telit.c:cfun_enable_cb() 0x9b6af8 src/modem.c:modem_change_state() old state: 0, new state: 1 plugins/telit.c:telit_pre_sim() 0x9b6af8 Aux: > AT&C0\r src/sim.c:ofono_sim_add_state_watch() 0x9afc98 src/sim.c:ofono_sim_add_state_watch() 0x9afc98 src/sim.c:ofono_sim_add_state_watch() 0x9afc98 Aux: < \r\nOK\r\n Aux: > AT+GCAP\r Aux: < \r\n+GCAP: +CGSM,+DS,+FCLASS,+MS,+ES\r\n\r\nOK\r\n Aux: > AT+CRC=1\r Aux: < \r\nOK\r\n Aux: > AT+CLIP=1\r Aux: < \r\nOK\r\n Aux: > AT+CDIP=1\r Aux: < \r\nERROR\r\n Aux: > AT+CNAP=1\r Aux: < \r\nERROR\r\n Aux: > AT+COLP=1\r Aux: < \r\nOK\r\n Aux: > AT+CSSN=1,1\r Aux: < \r\nOK\r\n Aux: > AT+VTD?\r Aux: < \r\n0\r\n\r\nOK\r\n Aux: > AT+CCWA=1\r Aux: < \r\nOK\r\n drivers/atmodem/voicecall.c:at_voicecall_initialized() voicecall_init: registering to notifications src/sim.c:ofono_sim_add_state_watch() 0x9afc98 Aux: > AT#AUTOATT=0\r Aux: < \r\nOK\r\n Aux: > AT#QSS=2\r Aux: < \r\nOK\r\n Aux: > AT#QSS?\r Aux: < \r\n#QSS: 2,1\r\n\r\nOK\r\n plugins/telit.c:telit_qss_notify() 0x9b6af8 plugins/telit.c:switch_sim_state_status() 0x9b6af8, SIM status: 1 Aux: > AT+CGMI\r Aux: < \r\nTelit\r\n\r\nOK\r\n Aux: > AT+CLCC\r Aux: < \r\nOK\r\n Aux: > AT+CPIN?\r Aux: < \r\n+CPIN: READY\r\n\r\nOK\r\n Aux: > AT+CGMM\r Aux: < \r\nHE910\r\n\r\nOK\r\n Aux: > AT+CPMS?\r Aux: < \r\n+CPMS: "SM",0,25,"SM",0,25,"SM",0,25\r\n\r\nOK\r\n Aux: > AT+CGMR\r Aux: < \r\n12.00.002\r\n\r\nOK\r\n Aux: > AT+CSCS=?\r Aux: < \r\n+CSCS: ("GSM","IRA","8859-1","PCCP437","UCS2")\r\n\r\nOK\r\n Aux: > AT+CSMS=?\r Aux: < \r\n+CSMS: (0,1)\r\n\r\nOK\r\n drivers/atmodem/sms.c:at_csms_query_cb() CSMS query parsed successfully Aux: > AT+CRSM=192,28599\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n src/voicecall.c:ecc_g2_read_cb() 0 Aux: > AT+CGSN\r Aux: < \r\n357164045019588\r\n\r\nOK\r\n Aux: > AT+CPBS=?\r Aux: < \r\n+CPBS: ("SM","FD","LD","MC","RC","DC","ME","ON")\r\n\r\nOK\r\n Aux: > AT+CSMS=1\r Aux: < \r\n+CSMS: 1,1,1\r\n\r\nOK\r\n Aux: > AT+CRSM=192,28599\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n src/voicecall.c:ecc_g3_read_cb() 0 Aux: > AT+CSMS?\r Aux: < \r\n Aux: < +CSMS: 1,1,1,1\r\n\r\nOK\r\n Aux: > AT+CRSM=192,12258\r Aux: < \r\n+CRSM: 144,0,0000000A2FE204000EFFEE01020000\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_info_cb() crsm_info_cb: 90, 00, 15 Aux: > AT+CMGF=?\r Aux: < \r\n+CMGF: (0,1)\r\n\r\nOK\r\n Aux: > AT+CRSM=176,12258,0,0,10\r Aux: < \r\n+CRSM: 144,0,98640244020000105139\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_read_cb() crsm_read_cb: 90, 00, 10 src/simfs.c:sim_fs_op_read_block_cb() bufoff: 0, dataoff: 0, tocopy: 10 Aux: > AT+CPMS=?\r Aux: < \r\n+CPMS: ("SM"),("SM"),("SM")\r\n\r\nOK\r\n Aux: > AT+CRSM=192,28421\r Aux: < \r\n+CME ERROR: 4\r\n Aux: > AT+CMGF=0\r Aux: < \r\nOK\r\n Aux: > AT+CRSM=192,12037\r Aux: < \r\n+CME ERROR: 4\r\n Aux: > AT+CPMS="SM","SM","SM"\r Aux: < \r\n+CPMS: 0,25,0,25,0,25\r\n\r\nOK\r\n Aux: > AT+CPIN?\r Aux: < \r\n+CPIN: READY\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_cpin_cb() crsm_pin_cb: READY drivers/atmodem/sim.c:at_pin_retries_query() Aux: > AT+CNMI=?\r Aux: < \r\n+CNMI: (0-3),(0-3),(0,2),(0-2),(0,1)\r\n\r\nOK\r\n drivers/atmodem/sms.c:build_cnmi_string() drivers/atmodem/sms.c:construct_ack_pdu() Aux: > AT#PCT\r Aux: < \r\n#PCT: 3\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_pct_cb() Note: No password required, returning maximum retries: drivers/atmodem/sim.c:at_pct_cb() retry counter id=1, val=3 drivers/atmodem/sim.c:at_pct_cb() retry counter id=4, val=3 drivers/atmodem/sim.c:at_pct_cb() retry counter id=9, val=10 drivers/atmodem/sim.c:at_pct_cb() retry counter id=11, val=10 Aux: > AT+CRSM=192,28590\r Aux: < \r\n+CME ERROR: 4\r\n Aux: > AT+CNMI=2,2,2,1,0\r Aux: < \r\nOK\r\n src/sms.c:sms_restore_tx_queue() plugins/push-notification.c:sms_watch() registered plugins/smart-messaging.c:sms_watch() registered Aux: > AT+CRSM=192,28589\r Aux: < \r\n+CRSM: 144,0,000000036FAD04000EFFEE01020000\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_info_cb() crsm_info_cb: 90, 00, 15 Aux: > AT+CMGL=4\r Aux: < \r\nOK\r\n drivers/atmodem/sms.c:at_cmgl_done() Aux: > AT+CGSMS=3\r Aux: < \r\nOK\r\n Aux: > AT+CRSM=176,28589,0,0,3\r Aux: < \r\n Aux: < +CRSM: 144,0,00FFFF\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_read_cb() crsm_read_cb: 90, 00, 3 src/simfs.c:sim_fs_op_read_block_cb() bufoff: 0, dataoff: 0, tocopy: 3 EFad does not specify (optional) MNC length, defaulting to 2 Aux: > AT+CRSM=192,28438\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n Aux: > AT+CRSM=192,28472\r Aux: < \r\n+CRSM: 144,0,0000000E6F3804001EFFEE01020000\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_info_cb() crsm_info_cb: 90, 00, 15 Aux: > AT+CRSM=176,28472,0,0,14\r Aux: < \r\n+CRSM: 144,0,FF3FFF0F0300FC03000CC300F0C0\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_read_cb() crsm_read_cb: 90, 00, 14 src/simfs.c:sim_fs_op_read_block_cb() bufoff: 0, dataoff: 0, tocopy: 14 Aux: > AT+CRSM=192,28502\r Aux: < \r\n+CME ERROR: 4\r\n Aux: > AT+CIMI\r Aux: < \r\n240075990001159\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_cimi_cb() cimi_cb: 240075990001159 src/modem.c:modem_change_state() old state: 1, new state: 2 plugins/telit.c:telit_post_sim() 0x9b6af8 drivers/atmodem/gprs-context.c:at_gprs_context_probe() Aux: > AT+CGDCONT=?\r plugins/telit.c:telit_set_online() modem 0x9b6af8 online Aux: < \r\n+CGDCONT: (1-5),"IP",,,(0,1),(0,1)\r\n\r\nOK\r\n Aux: > AT+CFUN=1,0\r Aux: < \r\nOK\r\n src/modem.c:modem_change_state() old state: 2, new state: 3 plugins/telit.c:telit_post_online() 0x9b6af8 Aux: > AT#QSS?\r Aux: < \r\n#QSS: 2,1\r\n\r\nOK\r\n plucins/telit.c:telit_qss_notify() 0x9b6af8 plugins/telit.c:switch_sim_state_status() 0x9b6af8, SIM status: 1 Aux: > AT+CRSM=192,28480\r Aux: < \r\n+CRSM: 144,0,000000386F40040011FFEE0102011C\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_info_cb() crsm_info_cb: 90, 00, 15 Aux: > AT+CGREG=?\r Aux: < \r\n+CGREG: (0-2)\r\n\r\nOK\r\n Aux: > AT+CREG=?\r Aux: < \r\n Aux: < +CREG: (0-2)\r\n\r\nOK\r\n Aux: > AT+CSCS?\r Aux: < \r\n+CSCS: "IRA"\r\n\r\nOK\r\n Aux: > AT+CUSD=1\r Aux: < \r\nOK\r\n Aux: > AT+CAOC=2\r Aux: < \r\nOK\r\n Aux: > AT+CCWE=1\r Aux: < \r\nOK\r\n Aux: > AT+CPIN?\r Aux: < \r\n+CPIN: READY\r\n\r\nOK\r\n Aux: > AT+CRSM=178,28480,1,4,28\r Aux: < \r\n+CRSM: 144,0,FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_read_cb() crsm_read_cb: 90, 00, 28 Aux: > AT+CGREG=2\r Aux: < \r\nOK\r\n Aux: > AT+CGAUTO=0\r Aux: < \r\nERROR\r\n Aux: > AT+CGEREP=2,1\r Aux: < \r\nOK\r\n Aux: > AT+CREG=2\r Aux: < \r\nOK\r\n Aux: > AT+CPMS?\r Aux: < \r\n+CPMS: "SM",0,25,"SM",0,25,"SM",0,25\r\n\r\nOK\r\n Aux: > AT+CRSM=178,28480,2,4,28\r Aux: < \r\n+CRSM: 144,0,FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF\r\n\r\nOK\r\n drivers/atmodem/sim.c:at_crsm_read_cb() crsm_read_cb: 90, 00, 28 Aux: > AT#PSNT=1\r Aux: < \r\nOK\r\n Aux: > AT+CPSB=1\r Aux: < \r\nERROR\r\n Aux: > AT+CIND=?\r Aux: < \r\n+CIND: (("battchg",(0-5,99)),("signal",(0-7,99)),("service",(0,1)),("sounder",(0,1)),("messn Aux: > AT+CRSM=192,28489\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n Aux: > AT+CMER=?\r Aux: < \r\n+CMER: (0-3),(0),(0),(0,2),(0,1)\r\n\r\nOK\r\n drivers/atmodem/network-registration.c:build_cmer_string() Aux: > AT+CRSM=192,20256\r Aux: < \r\n+CME ERROR: 4\r\n Aux: > AT+CMER=3,0,0,2\r Aux: < \r\nOK\r\n Aux: < \r\n+CIEV: battchg,0\r\n\r\n+CIEV: signal,7\r\n\r\n+CIEV: service,1\r\n\r\n+CIEV: sounder,0\r\nn src/sim.c:ofono_sim_add_spn_watch() 0x9afc98 src/network.c:__ofono_netreg_add_status_watch() 0x9b9ff0 src/network.c:__ofono_netreg_add_status_watch() 0x9b9ff0 Aux: > AT+CRSM=192,28618\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n Unable to read waiting messages numbers from SIM Aux: > AT+CREG?\r Aux: < \r\n+CREG: 2,1,"00D4","0D45D96",2\r\n\r\nOK\r\n src/network.c:ofono_netreg_status_notify() /telit_0 status 1 tech 2 src/gprs.c:netreg_status_changed() 1 Aux: > AT+CRSM=192,28617\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n Unable to read mailbox identifies from SIM Aux: > AT+COPS=3,2\r Aux: < \r\nOK\r\n Aux: > AT+COPS?\r Aux: < \r\n+COPS: 0,2,"24005",2\r\n\r\nOK\r\n drivers/atmodem/network-registration.c:cops_numeric_cb() Cops numeric got mcc: 240, mnc: 05 Aux: > AT+CIND?\r Aux: < \r\n+CIND: 0,7,1,0,0,0,0,0,5\r\n\r\nOK\r\n src/network.c:ofono_netreg_strength_notify() strength 100 Aux: > AT+CGATT=1\r Aux: < \r\nOK\r\n Aux: < \r\n+CGREG: 1,"00D4","0D45D96",2,"01"\r\n src/gprs.c:gprs_attach_callback() /telit_0 error = 0 src/gprs.c:ofono_gprs_status_notify() /telit_0 status 1 Aux: > AT+CIND?\r Aux: < \r\n+CIND: 0,7,1,0,0,0,0,0,5\r\n\r\nOK\r\n Aux: > AT+CRSM=192,28433\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n src/message-waiting.c:mw_cphs_mwis_read_cb() No CPHS MWIS on SIM Aux: > AT+COPS=3,0\r Aux: < \r\nOK\r\n Aux: > AT+COPS?\r Aux: < \r\n+COPS: 0,0,"S 05",2\r\n\r\nOK\r\n drivers/atmodem/network-registration.c:cops_cb() cops_cb: S 05, 240 05 2 src/network.c:current_operator_callback() 0x9b9ff0, (nil) src/gprs.c:netreg_status_changed() 1 Aux: > AT+CGREG?\r Aux: < \r\n Aux: < +CGREG: 2,1,"00D4","0D45D96",2,"01"\r\n\r\nOK\r\n src/gprs.c:registration_status_cb() /telit_0 error 0 status 1 src/gprs.c:ofono_gprs_status_notify() /telit_0 status 1 Aux: > AT+CRSM=192,28435\r Aux: < \r\n+CRSM: 148,4\r\n\r\nOK\r\n src/simfs.c:sim_fs_op_read_block() bufoff: 0, seekoff: 39, toread: 17 Aux: > AT+CRSM=192,28621\r drivers/atmodem/gprs-context.c:at_gprs_activate_primary() cid 1 Modem: > AT+CGDCONT=1,"IP","internet.tele2.se"\r Modem: < AT+CGDCONT=1,"IP","internet.tele2.se"\r Aux: < \r\n+CME ERROR: 4\r\n Aux: > AT+CRSM=192,28437\r