[EC200U200U_CN] Jio SIM Card Not Working but Other SIMs Work (ESP32-S3 + Internet Access Issue)

[Harshad_Chavan]

Module: Quectel EC200U
Firmware Version: EC200UCNAAR03A09M08
MCU Platform: ESP32-S3 (ESP-IDF)
Working SIMs: Airtel, Vodafone-Idea, BSNL
Problem SIM: Jio (India)
APN Used: jionet

Issue Description

I am using the EC200U module with an ESP32-S3 (ESP-IDF) and a Jio SIM card to access the internet via PPP over UART. The same setup works perfectly with Airtel, VI, and BSNL SIM cards. However, with the Jio SIM, I face the following issue:

• After initialization, the Jio SIM connects and works for 20–30 seconds**, and some data transfer occurs.
• After that, I receive only 7 bytes or fewer from the EC200U module via UART, as if the incoming buffer is partially filled or cut off.
• Then, all three module indicator lines—STA, N_STA, and N_MOD—go LOW (off) and automatically reset back ON, suggesting some kind of internal reboot or modem failure.
• After this reset, no more data is received from the EC200U module via UART, and the PPP session fails.
• I have tested this multiple times and the behavior is consistent only with Jio SIM. All other SIMs work continuously without issue.

Logs
pppos_input[2]: got 65 bytes
ppp_input[2]: ip in pbuf len=60
pppos_netif_output[2]: proto=0x21, len = 60
pppos_input[2]: got 109 bytes
ppp_input[2]: ip in pbuf len=40
ppp_input[2]: ip in pbuf len=60
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 76
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_input[2]: got 109 bytes
ppp_input[2]: ip in pbuf len=40
ppp_input[2]: ip in pbuf len=60
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 76
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
ppp_input[2]: ip in pbuf len=60
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 76
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_input[2]: got 7 bytes
pppos_netif_output[2]: proto=0x21, len = 76
pppos_netif_output[2]: proto=0x21, len = 76
pppos_input[2]: got 41 bytes
pppos_input[2]: got 19 bytes
pppos_input[2]: got 18 bytes
pppos_netif_output[2]: proto=0x21, len = 60
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52
pppos_netif_output[2]: proto=0x21, len = 52

[herbert.pan-Q]

EC200U-CN PPP Unable to get IPv4

Hi @Bean.Wang-Q, Something odd We have observed in PPP Mode (not using quectel-CM or ECM), We see a issue in IPCP negotiation, Between EC20 and EC200U with same SIM/Operator. EC20 connects to internet without issues, EC200U fails. Is there any latest firmware for EC200U-CN miniPCie please find PPP logs for EC20 and EC200U with same SIM/Operator EC20: Wed Apr 17 11:20:00 2024 daemon.debug pppd[2654]: rcvd [LCP DiscReq id=0x2 magic=0x2beccce9]** Wed Apr 17 11:20:00 2024 daemon.debug pppd[26…

[Bean.Wang-Q]

I am not sure whether it support the IPv6 only case.
Maybe you can try to enable the IPV4 with the ipv6 only network such as JIO.
AT+QCFG=“nat/cid”,1

[vignesh_sai07]

Hi Harshad ,
As im facing the similar issue with the jionet as ipv6 only supported and i could’t establish the internet over ppp uart.
and im facing some trouble on the vi sime either , can you please share the firmware of ppp establishment over other apn’s like vi or airtel.
Im using Esp-idf V5.5.
Looking forward for your responce.
Thanks and Regards
Id:-Vigneshvishalansai@gmail.com
vignesh sai