Swarm M138 - $GJ - GPS Jamming;Spoofing Indication

$GJ - GPS Jamming/Spoofing Indication
Set or query the rate for $GJ unsolicited report messages for jamming and spoofing indicators.
Also can retrieve the most current $GJ message.
$GJ <@|?|<rate>>*xx
Parameter
Description
@
Repeat most recent $GJ message
?
Query current $GJ rate
rate
Disable or set rate of $GJ messages
Returns one of:
Parameter
Description
$GJ <spoof_state>,<jamming_level>*xx
The most recent $GJ message.
$GJ <rate>*xx
The current $GJ rate
$GJ OK*xx
Parameters updated successfully
$GJ ERR*xx
Command input error
Parameter
Description
spoof_state
0 Spoofing unknown or deactivated
1 No spoofing indicated
2 Spoofing indicated
3 Multiple spoofing indications
jamming_level
Value ranging from 0 to 255 indicating how much carrier wave (CW)
jamming is detected. 0 = no CW jamming, 255 = strong CW jamming
November 2021 Swarm M138 Modem Manual - Rev 1.00 41/77