- SIM card/carrier condition & Symptom
TW CHT Telcom, NB-IOT, Band 8
→ Highly chance of our on-hand BG77 modules would encounter stuck in “SEARCH” status or “LIMSRV”
TW FET Telcom, NB-IOT, Band 28, 3
→ Works normally without problem.
1NCE, NB-IOT, Roaming to CHT Band 8
→ Longer search time (may due to roaming) but so far no stuck issue being observed.
- FW & AT Commands for BG77 setup
a. FW rev: BG77LAR02A04_01.201.01.201
b. Module Reset with ~3.5s
c. AT Command Initialization
AT&F
AT+QSIMDET=0,0
ATI
AT+GSN
AT+CIMI
AT+QGMR
AT+CPSMS=0
AT+CFUN=1,0
AT+CTZU=0
AT+COPS=0
AT+QCFG=“NWSCANMODE”,3,1
AT+QCFG=“SERVICEDOMAIN”,1,1
AT+QCFG=“NWSCANSEQ”,0302,1
AT+QCFG=“BAND”,0,8000084,8000084 (bAND 3, 8, 28)
AT+QCFG=“IOTOPMODE”,2,1
AT+QGPSCFG=“PRIORITY”,1
AT+QGPSCFG=“GNSSCONFIG”,3
AT+QGPSXTRA=1
AT+QGPSXTRATIME?
AT+QGPSCFG=“XTRA_INFO”
AT+QGPSCFG=“XTRAFILESIZE”,7
AT+QGPSCFG=“XTRA_AUTODOWNLOAD”,1
AT+QGPSLOC=4,2