root@MiFi:~# echo '{"code":"*101#"}' | sh -x /usr/libexec/rpcd/easyconfig call ussd
+ . /usr/share/libubox/jshn.sh
+ TIMEISVALID=false
+ grep -q 'time is valid' /tmp/state/dnsmasqsec
+ TIMEISVALID=true
+ '[' -e /dev/rtc0 ]
+ uci -q get network.loopback.device
+ T=lo
+ '[' xlo '=' xlo ]
+ DEVICESECTION=true
+ show_ussd
+ read input
+ json_load '{"code":"*101#"}'
+ jshn -r '{"code":"*101#"}'
+ eval 'json_init;
json_add_string '"'"'code'"'"' '"'"'*101#'"'"';'
+ json_init
+ json_cleanup
+ local unset tmp
+ _json_get_var unset JSON_UNSET
+ eval 'unset="$JSON_UNSET"'
+ unset=
+ unset U_J_V K_J_V S_J_V T_J_V N_J_V J_V
+ unset JSON_SEQ JSON_CUR JSON_UNSET
+ export -n 'JSON_SEQ=0'
+ export -- 'JSON_CUR=J_V' 'K_J_V='
+ json_add_string code '*101#'
+ local cur
+ _json_get_var cur JSON_CUR
+ eval 'cur="$JSON_CUR"'
+ cur=J_V
+ _json_add_generic string code '*101#' J_V
+ local var
+ '[' J_V '=' J_A ]
+ var=code
+ '[[' code '==' code ]]
+ export -- 'J_V_code=*101#' 'T_J_V_code=string'
+ _jshn_append JSON_UNSET J_V_code
+ local '_a_value=J_V_code'
+ eval 'JSON_UNSET="${JSON_UNSET} $_a_value"'
+ JSON_UNSET=' J_V_code'
+ _jshn_append K_J_V code
+ local '_a_value=code'
+ eval 'K_J_V="${K_J_V} $_a_value"'
+ K_J_V=' code'
+ json_get_var code code
+ local '__dest=code'
+ local __cur
+ _json_get_var __cur JSON_CUR
+ eval '__cur="$JSON_CUR"'
+ __cur=J_V
+ local '__var=J_V_code'
+ eval 'export -- "code=${J_V_code:-}"; [ -n "${J_V_code+x}${3+x}" ]'
+ export -- 'code=*101#'
+ '[' -n x ]
+ '[' -z '*101#' ]
+ OPT=
+ uci -q get easyconfig.ussd.raw_input
+ T=1
+ '[' x1 '=' x1 ]
+ OPT=' -R'
+ uci -q get easyconfig.ussd.raw_output
+ T=1
+ '[' x1 '=' x1 ]
+ OPT=' -R -r'
+ /usr/share/easyconfig/modem/detect.sh
+ DEVICE=/dev/ttyUSB3
+ '[' -n /dev/ttyUSB3 ]
+ sms_tool -d /dev/ttyUSB3 -R -r ussd '*101#'
+ T=
+ json_init
+ json_cleanup
+ local unset tmp
+ _json_get_var unset JSON_UNSET
+ eval 'unset="$JSON_UNSET"'
+ unset=' J_V_code'
+ unset U_J_V_code K_J_V_code S_J_V_code T_J_V_code N_J_V_code J_V_code
+ unset U_J_V K_J_V S_J_V T_J_V N_J_V J_V
+ unset JSON_SEQ JSON_CUR JSON_UNSET
+ export -n 'JSON_SEQ=0'
+ export -- 'JSON_CUR=J_V' 'K_J_V='
+ json_add_string result 
+ local cur
+ _json_get_var cur JSON_CUR
+ eval 'cur="$JSON_CUR"'
+ cur=J_V
+ _json_add_generic string result  J_V
+ local var
+ '[' J_V '=' J_A ]
+ var=result
+ '[[' result '==' result ]]
+ export -- 'J_V_result=' 'T_J_V_result=string'
+ _jshn_append JSON_UNSET J_V_result
+ local '_a_value=J_V_result'
+ eval 'JSON_UNSET="${JSON_UNSET} $_a_value"'
+ JSON_UNSET=' J_V_result'
+ _jshn_append K_J_V result
+ local '_a_value=result'
+ eval 'K_J_V="${K_J_V} $_a_value"'
+ K_J_V=' result'
+ json_dump
+ jshn -w
{ "result": "" }
+ exit 0

root@MiFi:~# sms_tool -d /dev/ttyUSB3 -R -r ussd '*101#'
No response from modem.