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Hello,

I am attempting to write a simple Lua dissector that displays a BLE advertisement's raw payload data, nothing fancy. I am using a nRF BLE Sniffer Dongle & the related capture plugin to capture the BLE advertisements.

However, after running the script on some example vendor/manufacturer-specific advertisements, the raw payload data is returned with the value <missing>. I tried diagnosing using the console, but it seems like printing the value is working.

Please see the below code:

local msgData = Field.new('btcommon.eir_ad.entry.data')

local bgNotificationData = Proto('bgadv', 'Background Notification Data')

local rawMessage = ProtoField.bytes('bgadv.data')

bgNotificationData.fields =
{
    rawMessage,
}

function bgNotificationData.dissector(tvb, pinfo, tree)
    local btMsgData = msgData()

    local subtree = tree:add(bgNotificationData, btMsgData, "Message Data")
    subtree:add(rawMessage, tostring(btMsgData))
end

register_postdissector(bgNotificationData)

I have a feeling the issue is in the below line:

subtree:add(rawMessage, tostring(btMsgData))

But I can't find any info about subtree:add returning the value <missing>. Any help would be great, TIA!

Hello,

I am attempting to write a simple Lua dissector that displays a BLE advertisement's raw payload data, nothing fancy. This raw payload data is already defined with the field: "btcommon.eir_ad.entry.data". I want to use this field instead of manually parsing the whole tvb buffer from the dissector callback function.

I am using a nRF BLE Sniffer Dongle & the related capture plugin to capture the BLE advertisements.advertisements, so this is where the "btcommon.eir_ad.entry.data" field is coming from.

However, after running the script on some example vendor/manufacturer-specific advertisements, the raw payload data is returned with the value <missing>. I tried diagnosing using the console, but it seems like printing the value is working.

Please see the below code:

local msgData = Field.new('btcommon.eir_ad.entry.data')

local bgNotificationData = Proto('bgadv', 'Background Notification Data')

local rawMessage = ProtoField.bytes('bgadv.data')

bgNotificationData.fields =
{
    rawMessage,
}

function bgNotificationData.dissector(tvb, pinfo, tree)
    local btMsgData = msgData()

    local subtree = tree:add(bgNotificationData, btMsgData, "Message Data")
    subtree:add(rawMessage, tostring(btMsgData))
end

register_postdissector(bgNotificationData)

I have a feeling the issue is in the below line:

subtree:add(rawMessage, tostring(btMsgData))

But I can't find any info about subtree:add returning the value <missing>. Any tostring(btMsgData) returns the string that I am looking for... any help would be great, TIA!

Hello,

I am attempting to write a simple Lua dissector that displays a BLE advertisement's raw payload data, nothing fancy. This raw payload data is already defined with the field: "btcommon.eir_ad.entry.data". I want to use this field instead of manually parsing the whole tvb buffer from the dissector callback function.

I am using a nRF BLE Sniffer Dongle & the related capture plugin to capture the BLE advertisements, so this is where the "btcommon.eir_ad.entry.data" field is coming from.

However, after running the script on some example vendor/manufacturer-specific advertisements, the raw payload data is returned with the value <missing>. I tried diagnosing using the console, but it seems like printing the value is working.

I am using a nRF BLE Sniffer Dongle & the related capture plugin to capture the BLE advertisements, so this is why the "btcommon.eir_ad.entry.data" field is being used, and where the data is supposed to be coming from. This may be the issue - is it possible to reference a field rather than the whole tvb buffer?

Please see the below code:

local msgData = Field.new('btcommon.eir_ad.entry.data')

local bgNotificationData = Proto('bgadv', 'Background Notification Data')

local rawMessage = ProtoField.bytes('bgadv.data')

bgNotificationData.fields =
{
    rawMessage,
}

function bgNotificationData.dissector(tvb, pinfo, tree)
    local btMsgData = msgData()

    local subtree = tree:add(bgNotificationData, btMsgData, "Message Data")
    subtree:add(rawMessage, tostring(btMsgData))
end

register_postdissector(bgNotificationData)

I have a feeling the issue is in the below line:

subtree:add(rawMessage, tostring(btMsgData))

But I can't find any info about subtree:add returning the value <missing>. tostring(btMsgData) returns the string that I am looking for... any help would be great, TIA!

Hello,

I am attempting to write a simple Lua dissector that displays a BLE advertisement's raw payload data, nothing fancy. This raw payload data is already defined with the field: "btcommon.eir_ad.entry.data". I want to use this field instead of manually parsing the whole tvb buffer from the dissector callback function.

However, after running the script on some example vendor/manufacturer-specific advertisements, the raw payload data is returned with the value <missing>. I tried diagnosing using the console, but it seems like printing the value is working.

I am using a nRF BLE Sniffer Dongle & the related capture plugin to capture the BLE advertisements, so this is why the "btcommon.eir_ad.entry.data" field is being used, and where the data is supposed to be coming from. This may be the issue - is it possible to reference a field rather than the whole tvb buffer?

Please see the below code:

local msgData = Field.new('btcommon.eir_ad.entry.data')

local bgNotificationData = Proto('bgadv', 'Background Notification Data')

local rawMessage = ProtoField.bytes('bgadv.data')

bgNotificationData.fields =
{
    rawMessage,
}

function bgNotificationData.dissector(tvb, pinfo, tree)
    local btMsgData = msgData()

    local subtree = tree:add(bgNotificationData, btMsgData, "Message Data")
    subtree:add(rawMessage, tostring(btMsgData))
end

register_postdissector(bgNotificationData)

I have a feeling the issue is in the below line:

subtree:add(rawMessage, tostring(btMsgData))

But I can't find any info about subtree:add returning the value <missing>. tostring(btMsgData) returns the string that I am looking for... any help would be great, TIA!

Hello,

I am attempting to write a simple Lua dissector that displays a BLE advertisement's raw payload data, nothing fancy. This raw payload data is already defined with the field: "btcommon.eir_ad.entry.data". I want to use this field instead of manually parsing the whole tvb buffer from the dissector callback function.

However, after running the script on some example vendor/manufacturer-specific advertisements, the raw payload data is returned with the value <missing>. I tried diagnosing using the console, but it seems like printing the value is working.

I am using a nRF BLE Sniffer Dongle & the related capture plugin to capture the BLE advertisements, so this is why the "btcommon.eir_ad.entry.data" field is being used, and where the data is supposed to be coming from. This may be the issue - is it possible to reference a field rather than the whole tvb buffer?

Please see the below code:

local msgData = Field.new('btcommon.eir_ad.entry.data')

local bgNotificationData = Proto('bgadv', 'Background Notification Data')

local rawMessage = ProtoField.bytes('bgadv.data')

bgNotificationData.fields =
{
    rawMessage,
}

function bgNotificationData.dissector(tvb, pinfo, tree)
    local btMsgData = msgData()

    local subtree = tree:add(bgNotificationData, btMsgData, "Message Data")
    subtree:add(rawMessage, tostring(btMsgData))
end

register_postdissector(bgNotificationData)

I have a feeling the issue is in the below line:

subtree:add(rawMessage, tostring(btMsgData))

But I can't find any info about subtree:add returning the value <missing>. tostring(btMsgData) returns the string that I am looking for... any help would be great, TIA!

Hello,

I am attempting to write a simple Lua dissector that displays a BLE advertisement's raw payload data, nothing fancy. This raw payload data is already defined with the field: "btcommon.eir_ad.entry.data". I want to use this field instead of manually parsing the whole tvb buffer from the dissector callback function.

However, after running the script on some example vendor/manufacturer-specific advertisements, the raw payload data is returned with the value <missing>. I tried diagnosing using the console, but it seems like printing the value is working.

I am using a nRF BLE Sniffer Dongle & the related capture plugin to capture the BLE advertisements, so this is why the "btcommon.eir_ad.entry.data" field is being used, and where the data is supposed to be coming from. This may be the issue - is it possible to reference a field rather than the whole tvb buffer?

Please see the below code:

local msgData = Field.new('btcommon.eir_ad.entry.data')

local bgNotificationData = Proto('bgadv', 'Background Notification Data')

local rawMessage = ProtoField.bytes('bgadv.data')

bgNotificationData.fields =
{
    rawMessage,
}

function bgNotificationData.dissector(tvb, pinfo, tree)
    local btMsgData = msgData()

    local subtree = tree:add(bgNotificationData, btMsgData, "Message Data")
    subtree:add(rawMessage, tostring(btMsgData))
end

register_postdissector(bgNotificationData)

I have a feeling the issue is in the below line:

subtree:add(rawMessage, tostring(btMsgData))

But I can't find any info about subtree:add returning the value <missing>. tostring(btMsgData) returns the string that I am looking for... any help would be great, TIA!